diff --git a/src/OBJECT/SMESH_Actor.cxx b/src/OBJECT/SMESH_Actor.cxx
index 6bd4e2c62..b3527bc88 100644
--- a/src/OBJECT/SMESH_Actor.cxx
+++ b/src/OBJECT/SMESH_Actor.cxx
@@ -1085,7 +1085,7 @@ void SMESH_ActorDef::SetControlMode( eControl theMode, bool theCheckEntityMode )
     }
     QString aTitle = QString(myScalarBarActor->GetTitle());
     aTitle.replace(QRegExp("(:\\s).*"),"\\1"+ QString::number(GetNumberControlEntities()));
-    myScalarBarActor->SetTitle(aTitle.toLatin1().constData());
+    myScalarBarActor->SetTitle(aTitle.toUtf8().constData());
 
   }
   else {
diff --git a/src/OBJECT/SMESH_PreviewActorsCollection.cxx b/src/OBJECT/SMESH_PreviewActorsCollection.cxx
index 4269c50ad..7fcd1bcb5 100644
--- a/src/OBJECT/SMESH_PreviewActorsCollection.cxx
+++ b/src/OBJECT/SMESH_PreviewActorsCollection.cxx
@@ -84,7 +84,7 @@ bool SMESH_PreviewActorsCollection::Init( const TopoDS_Shape& theShape,
     return false;
 
   // Handle( SALOME_InteractiveObject ) anIO = new SALOME_InteractiveObject();
-  // anIO->setEntry( theEntry.toLatin1().constData() );
+  // anIO->setEntry( theEntry.toUtf8().constData() );
   
   // get indexes of seleted elements
   TopExp::MapShapes( theMainShape, myMapOfShapes );
@@ -248,7 +248,7 @@ void SMESH_PreviewActorsCollection::showCurrentChunk()
       QString entry = QString( "%1_%2" ).arg( myEntry ).arg( index );
       // Create interactive object
       Handle( SALOME_InteractiveObject ) anIO = new SALOME_InteractiveObject();
-      anIO->setEntry( entry.toLatin1().constData() );
+      anIO->setEntry( entry.toUtf8().constData() );
       // Init Actor
       anActor->SetVectorMode( myType==TopAbs_EDGE );
       anActor->setIO( anIO );
diff --git a/src/SMESHFiltersSelection/SMESH_NumberFilter.cxx b/src/SMESHFiltersSelection/SMESH_NumberFilter.cxx
index 01595554c..ae06c0f10 100644
--- a/src/SMESHFiltersSelection/SMESH_NumberFilter.cxx
+++ b/src/SMESHFiltersSelection/SMESH_NumberFilter.cxx
@@ -175,7 +175,7 @@ GEOM::GEOM_Object_ptr SMESH_NumberFilter::getGeom
   _PTR(Study) study = appStudy->studyDS();
   QString entry = owner->entry();
 
-  _PTR(SObject) aSO( study->FindObjectID( entry.toLatin1().data() ) ), aRefSO;
+  _PTR(SObject) aSO( study->FindObjectID( entry.toUtf8().data() ) ), aRefSO;
   if( extractReference && aSO && aSO->ReferencedObject( aRefSO ) )
     aSO = aRefSO;
 
diff --git a/src/SMESHFiltersSelection/SMESH_TypeFilter.cxx b/src/SMESHFiltersSelection/SMESH_TypeFilter.cxx
index a405af184..df5d538af 100644
--- a/src/SMESHFiltersSelection/SMESH_TypeFilter.cxx
+++ b/src/SMESHFiltersSelection/SMESH_TypeFilter.cxx
@@ -86,7 +86,7 @@ bool SMESH_TypeFilter::isOk (const SUIT_DataOwner* theDataOwner) const
     _PTR(Study) study = appStudy->studyDS();
     QString entry = owner->entry();
 
-    _PTR(SObject) obj (study->FindObjectID(entry.toLatin1().data())), aRefSO;
+    _PTR(SObject) obj (study->FindObjectID(entry.toUtf8().data())), aRefSO;
     if( extractReference && obj && obj->ReferencedObject( aRefSO ) )
       obj = aRefSO;
     if (!obj) return false;
diff --git a/src/SMESHGUI/SMESHGUI.cxx b/src/SMESHGUI/SMESHGUI.cxx
index 797674b12..59c7b4e3a 100644
--- a/src/SMESHGUI/SMESHGUI.cxx
+++ b/src/SMESHGUI/SMESHGUI.cxx
@@ -6195,7 +6195,7 @@ void SMESHGUI::restoreVisualParameters (int savePoint)
 
     // Check that the entry corresponds to a real object in the Study
     // as the object may be deleted or modified after the visual state is saved.
-    _PTR(SObject) so = studyDS->FindObjectID(entry.toLatin1().data());
+    _PTR(SObject) so = studyDS->FindObjectID(entry.toUtf8().data());
     if (!so) continue; //Skip the not existent entry
 
     std::vector<std::string> paramNames = ip->getAllParameterNames( *entIt );
@@ -6262,7 +6262,7 @@ void SMESHGUI::restoreVisualParameters (int savePoint)
                 SMESH_Actor* aGeomAc = SMESH_Actor::SafeDownCast(ac);
                 if (aGeomAc->hasIO()) {
                   Handle(SALOME_InteractiveObject) io = aGeomAc->getIO();
-                  if (io->hasEntry() && strcmp(io->getEntry(), entry.toLatin1().data()) == 0) {
+                  if (io->hasEntry() && strcmp(io->getEntry(), entry.toUtf8().data()) == 0) {
                     isFound = true;
                     vtkActors.Bind(viewIndex, aGeomAc);
                   }
@@ -6948,7 +6948,7 @@ void SMESHGUI::message( const QString& msg )
       // get study
       _PTR(Study) study = dynamic_cast<SalomeApp_Study*>( application()->activeStudy() )->studyDS();
       // get mesh name
-      _PTR(SObject) obj = study->FindObjectID( entry.toLatin1().constData() );
+      _PTR(SObject) obj = study->FindObjectID( entry.toUtf8().constData() );
       QString name;
       if ( obj )
         name = SMESH::fromUtf8(obj->GetName());
diff --git a/src/SMESHGUI/SMESHGUI_Add0DElemsOnAllNodesDlg.cxx b/src/SMESHGUI/SMESHGUI_Add0DElemsOnAllNodesDlg.cxx
index a015b4181..990ca5c80 100644
--- a/src/SMESHGUI/SMESHGUI_Add0DElemsOnAllNodesDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_Add0DElemsOnAllNodesDlg.cxx
@@ -442,7 +442,7 @@ bool SMESHGUI_Add0DElemsOnAllNodesOp::onApply()
 
     QString groupName = myDlg->myGroupListCmBox->currentText();
     SMESH::SMESH_IDSource_var newObj =
-      editor->Create0DElementsOnAllNodes( meshObject, groupName.toLatin1().data(),
+      editor->Create0DElementsOnAllNodes( meshObject, groupName.toUtf8().data(),
                                           myDlg->myDuplicateElemsChkBox->isChecked() );
 
     int newNb0D = mesh->Nb0DElements() - prevNb0D;
diff --git a/src/SMESHGUI/SMESHGUI_BuildCompoundDlg.cxx b/src/SMESHGUI/SMESHGUI_BuildCompoundDlg.cxx
index 0cd63352b..e865d823e 100644
--- a/src/SMESHGUI/SMESHGUI_BuildCompoundDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_BuildCompoundDlg.cxx
@@ -268,7 +268,7 @@ QString SMESHGUI_BuildCompoundDlg::GetDefaultName(const QString& theOperation)
   bool isUnique = false;
   while (!isUnique) {
     aName = theOperation + "_" + QString::number(++aNumber);
-    isUnique = (aSet.count(aName.toLatin1().data()) == 0);
+    isUnique = (aSet.count(aName.toUtf8().data()) == 0);
   }
 
   return aName;
@@ -299,7 +299,7 @@ bool SMESHGUI_BuildCompoundDlg::ClickOnApply()
     try {
 
       aMesh = myMeshArray[0]->GetMesh();
-      aMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      aMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       SMESH::SMESH_Gen_var aSMESHGen = SMESHGUI::GetSMESHGen();
       // concatenate meshes
diff --git a/src/SMESHGUI/SMESHGUI_ComputeDlg.cxx b/src/SMESHGUI/SMESHGUI_ComputeDlg.cxx
index 3c3363d6f..74b9f61e3 100644
--- a/src/SMESHGUI/SMESHGUI_ComputeDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ComputeDlg.cxx
@@ -1280,7 +1280,7 @@ void SMESHGUI_BaseComputeOp::onPublishShape()
       {
         QString name = GEOMBase::GetDefaultName( SMESH::shapeTypeName( myMainShape, "MAIN_SHAPE" ));
         SALOMEDS::SObject_wrap so = geomGen->AddInStudy( myMainShape,
-                                                         name.toLatin1().data(),
+                                                         name.toUtf8().data(),
                                                          GEOM::GEOM_Object::_nil());
         // look for myMainShape in the table
         for ( int r = 0, nr = table()->rowCount(); r < nr; ++r ) {
@@ -1299,7 +1299,7 @@ void SMESHGUI_BaseComputeOp::onPublishShape()
       }
       QString name = GEOMBase::GetDefaultName( SMESH::shapeTypeName( shape, "ERROR_SHAPE" ));
       SALOMEDS::SObject_wrap so = geomGen->AddInStudy( shape,
-                                                       name.toLatin1().data(), myMainShape);
+                                                       name.toUtf8().data(), myMainShape);
       if ( !so->_is_nil() ) {
         CORBA::String_var name  = so->GetName();
         CORBA::String_var entry = so->GetID();
@@ -1370,7 +1370,7 @@ void SMESHGUI_BaseComputeOp::onGroupOfBadMesh()
       else                    grName = "bad mesh of " + grName;
       SMESH::SMESH_Gen_var gen = getSMESHGUI()->GetSMESHGen();
       SMESH::ListOfGroups_var groups
-        ( gen->MakeGroupsOfBadInputElements(myMesh,curSub,grName.toLatin1().data()) );
+        ( gen->MakeGroupsOfBadInputElements(myMesh,curSub,grName.toUtf8().data()) );
       update( UF_ObjBrowser | UF_Model );
       if( LightApp_Application* anApp = dynamic_cast<LightApp_Application*>( application() ))
       {
diff --git a/src/SMESHGUI/SMESHGUI_ConvToQuadOp.cxx b/src/SMESHGUI/SMESHGUI_ConvToQuadOp.cxx
index 2e25f2c52..b2e7c993e 100644
--- a/src/SMESHGUI/SMESHGUI_ConvToQuadOp.cxx
+++ b/src/SMESHGUI/SMESHGUI_ConvToQuadOp.cxx
@@ -129,7 +129,7 @@ void SMESHGUI_ConvToQuadOp::selectionDone()
   try
   {
     QString anObjEntry = myDlg->selectedObject( 0 );
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
     if ( !pObj ) return;
 
     SMESH::SMESH_IDSource_var idSource = 
@@ -204,7 +204,7 @@ bool SMESHGUI_ConvToQuadOp::onApply()
   QString aMess;
 
   QString anObjEntry = myDlg->selectedObject( 0 );
-  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
   if ( !pObj )
   {
     dlg()->show();
@@ -383,7 +383,7 @@ SMESHGUI_ConvToQuadOp::DestinationMesh( const SMESH::SMESH_IDSource_var& idSourc
 void SMESHGUI_ConvToQuadOp::ConnectRadioButtons( int id )
 {
   QString anObjEntry = myDlg->selectedObject( 0 );
-  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
   if ( !pObj ) return;
 
   SMESH::SMESH_IDSource_var idSource = 
diff --git a/src/SMESHGUI/SMESHGUI_CopyMeshDlg.cxx b/src/SMESHGUI/SMESHGUI_CopyMeshDlg.cxx
index b6609fcff..27e70ac43 100644
--- a/src/SMESHGUI/SMESHGUI_CopyMeshDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_CopyMeshDlg.cxx
@@ -331,7 +331,7 @@ bool SMESHGUI_CopyMeshDlg::ClickOnApply()
       SMESH::SMESH_MeshEditor_var aMeshEditor = myMesh->GetMeshEditor();
       aPartToCopy = aMeshEditor->MakeIDSource( anElementsId, SMESH::ALL );
     }
-    QByteArray meshName = myMeshNameEdit->text().toLatin1();
+    QByteArray meshName = myMeshNameEdit->text().toUtf8();
     bool toCopyGroups = ( myCopyGroupsCheck->isChecked() );
     bool toKeepIDs    = ( myKeepIdsCheck->isChecked() );
 
diff --git a/src/SMESHGUI/SMESHGUI_CreatePatternDlg.cxx b/src/SMESHGUI/SMESHGUI_CreatePatternDlg.cxx
index 0f0611003..ab1d1e63b 100755
--- a/src/SMESHGUI/SMESHGUI_CreatePatternDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_CreatePatternDlg.cxx
@@ -399,7 +399,7 @@ void SMESHGUI_CreatePatternDlg::onSave()
 
     QFile aFile( fName );
     aFile.open( QIODevice::WriteOnly );
-    long aWritten = aFile.write( aData.toLatin1(), aLen );
+    long aWritten = aFile.write( aData.toUtf8(), aLen );
     aFile.close();
 
     if ( aWritten != aLen ) {
diff --git a/src/SMESHGUI/SMESHGUI_Displayer.cxx b/src/SMESHGUI/SMESHGUI_Displayer.cxx
index 633d9196a..eb9852486 100644
--- a/src/SMESHGUI/SMESHGUI_Displayer.cxx
+++ b/src/SMESHGUI/SMESHGUI_Displayer.cxx
@@ -66,13 +66,13 @@ SALOME_Prs* SMESHGUI_Displayer::buildPresentation( const QString& entry, SALOME_
     if( vtk_viewer )
     {
       SUIT_ViewWindow* wnd = vtk_viewer->getViewManager()->getActiveView();
-      SMESH_Actor* anActor = SMESH::FindActorByEntry( wnd, entry.toLatin1().data() );
+      SMESH_Actor* anActor = SMESH::FindActorByEntry( wnd, entry.toUtf8().data() );
       if( !anActor )
-        anActor = SMESH::CreateActor( entry.toLatin1().data(), true );
+        anActor = SMESH::CreateActor( entry.toUtf8().data(), true );
       if( anActor )
       {
         SMESH::DisplayActor( wnd, anActor );
-        prs = LightApp_Displayer::buildPresentation( entry.toLatin1().data(), aViewFrame );
+        prs = LightApp_Displayer::buildPresentation( entry.toUtf8().data(), aViewFrame );
       }
       if( prs )
         UpdatePrs( prs );
@@ -94,7 +94,7 @@ bool SMESHGUI_Displayer::canBeDisplayed( const QString& entry, const QString& vi
   if(viewer_type != SVTK_Viewer::Type())
     return res;
   
-  _PTR(SObject) obj = SMESH::getStudy()->FindObjectID( (const char*)entry.toLatin1() );
+  _PTR(SObject) obj = SMESH::getStudy()->FindObjectID( (const char*)entry.toUtf8() );
   CORBA::Object_var anObj = SMESH::SObjectToObject( obj );
   
     /*
diff --git a/src/SMESHGUI/SMESHGUI_DuplicateNodesDlg.cxx b/src/SMESHGUI/SMESHGUI_DuplicateNodesDlg.cxx
index 383c93685..16ad3b255 100644
--- a/src/SMESHGUI/SMESHGUI_DuplicateNodesDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_DuplicateNodesDlg.cxx
@@ -477,7 +477,7 @@ bool SMESHGUI_DuplicateNodesDlg::onApply()
       for ( int i = 0; i < myGroups1.count(); i++ )
       {
         SMESH::SMESH_Group_var group =
-          aMeshEditor->DoubleElements( myGroups1[i], groupName.toLatin1().data() );
+          aMeshEditor->DoubleElements( myGroups1[i], groupName.toUtf8().data() );
         if ( group->_is_nil() )
         {
           if ( toCreateElemGroup )
diff --git a/src/SMESHGUI/SMESHGUI_ExtrusionAlongPathDlg.cxx b/src/SMESHGUI/SMESHGUI_ExtrusionAlongPathDlg.cxx
index 417d1f803..ff4d6c9b4 100644
--- a/src/SMESHGUI/SMESHGUI_ExtrusionAlongPathDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ExtrusionAlongPathDlg.cxx
@@ -442,7 +442,7 @@ bool SMESHGUI_ExtrusionAlongPathDlg::ClickOnApply()
 
     SMESH::SMESH_Mesh_var mesh = SelectorWdg->GetMesh();
 
-    mesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+    mesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
     SMESH::ListOfIDSources_var nodes = new SMESH::ListOfIDSources();
     SMESH::ListOfIDSources_var edges = new SMESH::ListOfIDSources();
diff --git a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
index 7a37a1715..b46875689 100644
--- a/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ExtrusionDlg.cxx
@@ -1159,7 +1159,7 @@ bool SMESHGUI_ExtrusionDlg::ClickOnApply()
       SMESH::SMESH_MeshEditor_var meshEditor = mesh->GetMeshEditor();
       SMESH::ListOfGroups_var groups;
 
-      mesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      mesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       if ( ExtrMethod_RBut2->isVisible() &&
            ExtrMethod_RBut2->isChecked() ) // Extrusion by normal
diff --git a/src/SMESHGUI/SMESHGUI_FilterDlg.cxx b/src/SMESHGUI/SMESHGUI_FilterDlg.cxx
index d0f3a6512..8c42b0c86 100755
--- a/src/SMESHGUI/SMESHGUI_FilterDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_FilterDlg.cxx
@@ -3198,7 +3198,7 @@ bool SMESHGUI_FilterDlg::isValid() const
       QString aName;
       myTable->GetThreshold(i, aName);
 
-      std::vector<_PTR(SObject)> aList = SMESH::getStudy()->FindObjectByName(aName.toLatin1().constData(), "GEOM");
+      std::vector<_PTR(SObject)> aList = SMESH::getStudy()->FindObjectByName(aName.toUtf8().constData(), "GEOM");
       if (aList.size() == 0) {
         SUIT_MessageBox::information(SMESHGUI::desktop(), tr("SMESH_INSUFFICIENT_DATA"),
                                      tr("BAD_SHAPE_NAME").arg(aName));
diff --git a/src/SMESHGUI/SMESHGUI_FilterLibraryDlg.cxx b/src/SMESHGUI/SMESHGUI_FilterLibraryDlg.cxx
index acb75c273..ef1a2aa1b 100644
--- a/src/SMESHGUI/SMESHGUI_FilterLibraryDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_FilterLibraryDlg.cxx
@@ -430,7 +430,7 @@ bool SMESHGUI_FilterLibraryDlg::onApply()
   }
 
   if (myFileName->text() != myLibrary->GetFileName())
-    myLibrary->SetFileName( myFileName->text().toLatin1().constData() );
+    myLibrary->SetFileName( myFileName->text().toUtf8().constData() );
 
   bool aResult = false;
 
@@ -439,8 +439,8 @@ bool SMESHGUI_FilterLibraryDlg::onApply()
   } else if (myMode == EDIT || myMode == ADD_TO) {
     SMESH::Filter_var aFilter = createFilter();
     if (!myListBox->selectedItems().empty() && 
-        !myLibrary->Replace(myCurrFilterName.toLatin1().constData(),
-                            myName->text().toLatin1().constData(),
+        !myLibrary->Replace(myCurrFilterName.toUtf8().constData(),
+                            myName->text().toUtf8().constData(),
                             aFilter.in())) {
       SUIT_MessageBox::information(SMESHGUI::desktop(), tr("SMESH_ERROR"),
                                    tr("ERROR_OF_EDITING"));
@@ -662,7 +662,7 @@ void SMESHGUI_FilterLibraryDlg::processNewLibrary()
   if (aFilterMgr->_is_nil())
     return;
 
-  myLibrary = aFilterMgr->LoadLibrary(autoExtension(getFileName()).toLatin1().constData());
+  myLibrary = aFilterMgr->LoadLibrary(autoExtension(getFileName()).toUtf8().constData());
   if (myLibrary->_is_nil()) {
     if (myMode == COPY_FROM) {
       SUIT_MessageBox::information(SMESHGUI::desktop(), tr("SMESH_ERROR"),
@@ -670,7 +670,7 @@ void SMESHGUI_FilterLibraryDlg::processNewLibrary()
       return;
     } else {
       myLibrary = aFilterMgr->CreateLibrary();
-      myLibrary->SetFileName(getFileName().toLatin1().constData());
+      myLibrary->SetFileName(getFileName().toUtf8().constData());
     }
   }
 
@@ -822,14 +822,14 @@ void SMESHGUI_FilterLibraryDlg::onFilterChanged()
     }
 
     SMESH::Filter_var aFilter = createFilter();
-    myLibrary->Replace(myCurrFilterName.toLatin1().constData(), 
-                       myName->text().toLatin1().constData(), 
+    myLibrary->Replace(myCurrFilterName.toUtf8().constData(), 
+                       myName->text().toUtf8().constData(), 
                        aFilter);
   }
 
   // Fill table with filter parameters
 
-  SMESH::Filter_var aFilter = myLibrary->Copy(theName.toLatin1().constData());
+  SMESH::Filter_var aFilter = myLibrary->Copy(theName.toUtf8().constData());
   myCurrFilterName = theName;
   myCurrFilter = myListBox->currentRow();
   myName->setText(theName);
@@ -929,8 +929,8 @@ void SMESHGUI_FilterLibraryDlg::onAddBtnPressed()
       return;
 
     SMESH::Filter_var aFilter = createFilter();
-    myLibrary->Replace(myCurrFilterName.toLatin1().constData(), 
-                       myName->text().toLatin1().constData(), 
+    myLibrary->Replace(myCurrFilterName.toUtf8().constData(), 
+                       myName->text().toUtf8().constData(), 
                        aFilter);
   }
   myTable->Clear(myTable->GetType());
@@ -966,8 +966,8 @@ void SMESHGUI_FilterLibraryDlg::addFilterToLib (const QString& theName)
 
   // add new filter in library
   bool aResult = !aFilter->GetPredicate()->_is_nil()
-    ? myLibrary->Add(aName.toLatin1().constData(), aFilter)
-    : myLibrary->AddEmpty(aName.toLatin1().constData(), (SMESH::ElementType)myTable->GetType());
+    ? myLibrary->Add(aName.toUtf8().constData(), aFilter)
+    : myLibrary->AddEmpty(aName.toUtf8().constData(), (SMESH::ElementType)myTable->GetType());
 
   if (!aResult) {
     SUIT_MessageBox::information(SMESHGUI::desktop(), tr("SMESH_ERROR"),
@@ -1087,7 +1087,7 @@ void SMESHGUI_FilterLibraryDlg::onDeleteBtnPressed()
 
   int anIndex = getIndex(myCurrFilterName);
 
-  if (anIndex == -1 || !myLibrary->Delete(myCurrFilterName.toLatin1().constData())) {
+  if (anIndex == -1 || !myLibrary->Delete(myCurrFilterName.toUtf8().constData())) {
     SUIT_MessageBox::information(SMESHGUI::desktop(), tr("SMESH_ERROR"),
                                  tr("ERROR_OF_DELETING"));
   } else {
@@ -1179,8 +1179,8 @@ void SMESHGUI_FilterLibraryDlg::onNeedValidation()
     if (valid)
     {
       SMESH::Filter_var aFilter = createFilter(myTable->GetType());
-      myLibrary->Replace(myCurrFilterName.toLatin1().constData(),
-                         myName->text().toLatin1().constData(),
+      myLibrary->Replace(myCurrFilterName.toUtf8().constData(),
+                         myName->text().toUtf8().constData(),
                          aFilter);
     }
   }
diff --git a/src/SMESHGUI/SMESHGUI_GroupDlg.cxx b/src/SMESHGUI/SMESHGUI_GroupDlg.cxx
index dc1a29fa3..1425aaf2b 100644
--- a/src/SMESHGUI/SMESHGUI_GroupDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_GroupDlg.cxx
@@ -516,7 +516,7 @@ QString SMESHGUI_GroupDlg::GetDefaultName(const QString& theOperation)
   bool isUnique = false;
   while (!isUnique) {
     aName = theOperation + "_" + QString::number(++aNumber);
-    isUnique = (aSet.count(std::string(SMESH::toUtf8(aName))) == 0);
+    isUnique = (aSet.count(std::string(aName.toUtf8().constData())) == 0);
   }
 
   return aName;
@@ -531,7 +531,7 @@ void  SMESHGUI_GroupDlg::setDefaultName() const
   do
   {
     aResName = aPrefix + QString::number( i++ );
-    anObj = SMESH::getStudy()->FindObject( SMESH::toUtf8(aResName) );
+    anObj = SMESH::getStudy()->FindObject( aResName.toUtf8().constData() );
   }
   while ( anObj );
   myName->setText(aResName); 
@@ -597,7 +597,7 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_GroupBase_ptr theGroup,
   SALOMEDS::Color aColor = theGroup->GetColor();
   setGroupColor( aColor );
 
-  myMeshGroupLine->setText(SMESH::fromUtf8(theGroup->GetName()));
+  myMeshGroupLine->setText(theGroup->GetName());
 
   int aType = 0;
   switch(theGroup->GetType()) {
@@ -684,7 +684,7 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_GroupBase_ptr theGroup,
   {
     myNameChanged = true;
     myName->blockSignals(true);
-    myName->setText(SMESH::fromUtf8(theGroup->GetName()));
+    myName->setText(theGroup->GetName());
     myName->blockSignals(false);
   }
 
@@ -1050,7 +1050,7 @@ bool SMESHGUI_GroupDlg::onApply()
 
       if (myGeomObjects->length() == 1) {
         myGroupOnGeom = myMesh->CreateGroupFromGEOM(aType,
-                                                    SMESH::toUtf8(myName->text()),
+                                                    myName->text().toUtf8(),
                                                     myGeomObjects[0]);
       }
       else {
@@ -1091,11 +1091,11 @@ bool SMESHGUI_GroupDlg::onApply()
           aNewGeomGroupName += myName->text();
           SALOMEDS::SObject_var aNewGroupSO =
             geomGen->AddInStudy(aGroupVar,
-                                SMESH::toUtf8(aNewGeomGroupName), aMeshShape);
+                                aNewGeomGroupName.toUtf8(), aMeshShape);
         }
 
         myGroupOnGeom = myMesh->CreateGroupFromGEOM(aType,
-                                                    SMESH::toUtf8(myName->text()),
+                                                    myName->text().toUtf8(),
                                                     aGroupVar);
       }
       resultGroup = SMESH::SMESH_GroupBase::_narrow( myGroupOnGeom );
@@ -1119,8 +1119,8 @@ bool SMESHGUI_GroupDlg::onApply()
         return false;
 
       myGroupOnFilter = myMesh->CreateGroupFromFilter(aType,
-                                                      SMESH::toUtf8(myName->text()),
-                                                      myFilter);
+                                                      myName->text().toUtf8(),
+						      myFilter);
       resultGroup = SMESH::SMESH_GroupBase::_narrow( myGroupOnFilter );
       isCreation = true;
     }
@@ -1143,7 +1143,7 @@ bool SMESHGUI_GroupDlg::onApply()
     if( aMeshGroupSO )
       anEntryList.append( aMeshGroupSO->GetID().c_str() );
 
-    resultGroup->SetName(SMESH::toUtf8(myName->text().trimmed()));
+    resultGroup->SetName(myName->text().trimmed().toUtf8());
 
     if ( isCreation )
     {
@@ -1174,7 +1174,7 @@ bool SMESHGUI_GroupDlg::onApply()
             if ( !anActor ) return false;
             myActorsList.append( anActor );
           }
-          anActor->setName(SMESH::toUtf8(myName->text()));
+          anActor->setName(myName->text().toUtf8());
           QColor c;
           int delta;
           switch ( myTypeId ) {
diff --git a/src/SMESHGUI/SMESHGUI_GroupOnShapeDlg.cxx b/src/SMESHGUI/SMESHGUI_GroupOnShapeDlg.cxx
index 3c32b743e..ade4db03d 100644
--- a/src/SMESHGUI/SMESHGUI_GroupOnShapeDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_GroupOnShapeDlg.cxx
@@ -304,7 +304,7 @@ bool SMESHGUI_GroupOnShapeOp::onApply()
   if ( !aStudy ) return false;
 
   // mesh
-  _PTR(SObject) meshSO = aStudy->FindObjectID( myMeshID.toLatin1().data() );
+  _PTR(SObject) meshSO = aStudy->FindObjectID( myMeshID.toUtf8().data() );
   SMESH::SMESH_Mesh_var mesh = SMESH::SObjectToInterface<SMESH::SMESH_Mesh>( meshSO );
   if ( mesh->_is_nil() ) return false;
 
@@ -330,7 +330,7 @@ bool SMESHGUI_GroupOnShapeOp::onApply()
     for ( int i = 0; geomID != geomEnd; ++geomID, ++i )
     {
       // selected geom
-      _PTR(SObject) geomSO = aStudy->FindObjectID( geomID->toLatin1().data() );
+      _PTR(SObject) geomSO = aStudy->FindObjectID( geomID->toUtf8().data() );
       GEOM::GEOM_Object_var geom = SMESH::SObjectToInterface<GEOM::GEOM_Object>(geomSO);
       if ( geom->_is_nil() ) continue;
 
@@ -349,7 +349,7 @@ bool SMESHGUI_GroupOnShapeOp::onApply()
 //       groupNames.append( name );
 
       //printf( "apply() %s %s\n", (*geomID).latin1(), name.latin1() );
-      group = mesh->CreateGroupFromGEOM( elemType, name.toLatin1().data(), geom );
+      group = mesh->CreateGroupFromGEOM( elemType, name.toUtf8().data(), geom );
       if( !group->_is_nil() )
         if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( group ) )
           anEntryList.append( aSObject->GetID().c_str() );
@@ -462,7 +462,7 @@ void SMESHGUI_GroupOnShapeOp::selectionDone()
     // study
     if (_PTR(Study) aStudy = SMESH::getStudy()) {
       // mesh
-      if (_PTR(SObject)  meshSO = aStudy->FindObjectID( myMeshID.toLatin1().data() )) {
+      if (_PTR(SObject)  meshSO = aStudy->FindObjectID( myMeshID.toUtf8().data() )) {
         // shape to mesh
         _PTR(SObject) anObj, shapeToMesh;
         if (meshSO->FindSubObject(1, anObj) && anObj->ReferencedObject(shapeToMesh)) {
@@ -470,7 +470,7 @@ void SMESHGUI_GroupOnShapeOp::selectionDone()
           QStringList::iterator name = names.begin(), id = ids.begin(), idEnd = ids.end();
           for (; id != idEnd; ++id, ++name ) {
             // shape SO
-            if (_PTR(SObject) shapeSO = aStudy->FindObjectID( id->toLatin1().data() )) {
+            if (_PTR(SObject) shapeSO = aStudy->FindObjectID( id->toUtf8().data() )) {
             // check if shape SO is a child of shape to mesh 
               while ( shapeSO && shapeSO->GetID() != shapeToMesh->GetID() )
                 if  ( shapeSO->Depth() < 2 )
diff --git a/src/SMESHGUI/SMESHGUI_GroupOpDlg.cxx b/src/SMESHGUI/SMESHGUI_GroupOpDlg.cxx
index b4084b665..c89878cd6 100644
--- a/src/SMESHGUI/SMESHGUI_GroupOpDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_GroupOpDlg.cxx
@@ -652,7 +652,7 @@ bool SMESHGUI_UnionGroupsDlg::onApply()
   {
     SMESH::ListOfGroups_var aList = convert( myGroups );
     SMESH::SMESH_Group_var aNewGrp = 
-      aMesh->UnionListOfGroups( aList, aName.toLatin1().constData() );
+      aMesh->UnionListOfGroups( aList, aName.toUtf8().constData() );
     if ( !CORBA::is_nil( aNewGrp ) )
     {
       aNewGrp->SetColor(  getColor() );
@@ -761,7 +761,7 @@ bool SMESHGUI_IntersectGroupsDlg::onApply()
   {
     SMESH::ListOfGroups_var aList = convert( myGroups );
     SMESH::SMESH_Group_var aNewGrp = 
-      aMesh->IntersectListOfGroups( aList, aName.toLatin1().constData() );
+      aMesh->IntersectListOfGroups( aList, aName.toUtf8().constData() );
     if ( !CORBA::is_nil( aNewGrp ) )
     {
       aNewGrp->SetColor(  getColor() );
@@ -934,7 +934,7 @@ bool SMESHGUI_CutGroupsDlg::onApply()
     SMESH::ListOfGroups_var aList1 = convert( myGroups1 );
     SMESH::ListOfGroups_var aList2 = convert( myGroups2 );
     SMESH::SMESH_Group_var aNewGrp = 
-      aMesh->CutListOfGroups( aList1, aList2, aName.toLatin1().constData() );
+      aMesh->CutListOfGroups( aList1, aList2, aName.toUtf8().constData() );
     if ( !CORBA::is_nil( aNewGrp ) )
     {
       aNewGrp->SetColor(  getColor() );
@@ -1120,7 +1120,7 @@ bool SMESHGUI_DimGroupDlg::onApply()
       (SMESH::NB_COMMON_NODES_ENUM) myNbNoCombo->currentIndex();
 
     SMESH::SMESH_Group_var aNewGrp =
-      aMesh->CreateDimGroup( aList, anElemType, aName.toLatin1().constData(),
+      aMesh->CreateDimGroup( aList, anElemType, aName.toUtf8().constData(),
                              aNbCoNodes, myUnderlOnlyChk->isChecked() );
     if ( !CORBA::is_nil( aNewGrp ) )
     {
diff --git a/src/SMESHGUI/SMESHGUI_GroupUtils.cxx b/src/SMESHGUI/SMESHGUI_GroupUtils.cxx
index fbdbd43f6..664e83672 100644
--- a/src/SMESHGUI/SMESHGUI_GroupUtils.cxx
+++ b/src/SMESHGUI/SMESHGUI_GroupUtils.cxx
@@ -42,7 +42,7 @@ namespace SMESH
     SMESH::SMESH_Group_var aGroup;
     try {
       if ( !theMesh->_is_nil() )
-        aGroup = theMesh->CreateGroup( theType, SMESH::toUtf8(theGroupName) );
+        aGroup = theMesh->CreateGroup( theType, theGroupName.toUtf8() );
     }
     catch( const SALOME::SALOME_Exception& S_ex ) {
       SalomeApp_Tools::QtCatchCorbaException( S_ex );
diff --git a/src/SMESHGUI/SMESHGUI_Hypotheses.h b/src/SMESHGUI/SMESHGUI_Hypotheses.h
index f989a49ff..933e5a67b 100644
--- a/src/SMESHGUI/SMESHGUI_Hypotheses.h
+++ b/src/SMESHGUI/SMESHGUI_Hypotheses.h
@@ -90,7 +90,7 @@ protected:
       isVariable = false;
     }
     const char* text() const {
-      ((QByteArray&) myTextAsBytes) = myText.toLatin1(); return myTextAsBytes.constData();
+      ((QByteArray&) myTextAsBytes) = myText.toUtf8(); return myTextAsBytes.constData();
     }
   };
 
diff --git a/src/SMESHGUI/SMESHGUI_HypothesesUtils.cxx b/src/SMESHGUI/SMESHGUI_HypothesesUtils.cxx
index 2ca363488..232c9296b 100644
--- a/src/SMESHGUI/SMESHGUI_HypothesesUtils.cxx
+++ b/src/SMESHGUI/SMESHGUI_HypothesesUtils.cxx
@@ -521,7 +521,7 @@ namespace SMESH
       try {
         // load plugin library
         if(MYDEBUG) MESSAGE("Loading client meshers plugin library ...");
-        LibHandle libHandle = LoadLib( aClientLibName.toLatin1().data() );
+        LibHandle libHandle = LoadLib( aClientLibName.toUtf8().data() );
         if (!libHandle) {
           // report any error, if occurred
           {
@@ -585,7 +585,7 @@ namespace SMESH
     try {
       SMESH::SMESH_Hypothesis_var aHypothesis;
       aHypothesis = SMESHGUI::GetSMESHGen()->CreateHypothesis(aHypType.toLatin1().data(),
-                                                              aServLib.toLatin1().data());
+                                                              aServLib.toUtf8().data());
       if (!aHypothesis->_is_nil()) {
         _PTR(SObject) aHypSObject = SMESH::FindSObject(aHypothesis.in());
         if (aHypSObject) {
@@ -613,7 +613,7 @@ namespace SMESH
     HypothesisData* aHypData = GetHypothesisData(aHypType);
     QString aServLib = aHypData->ServerLibName;
     return SMESHGUI::GetSMESHGen()->IsApplicable( aHypType.toLatin1().data(),
-                                                  aServLib.toLatin1().data(),
+                                                  aServLib.toUtf8().data(),
                                                   theGeomObject,
                                                   toCheckAll);
   }
diff --git a/src/SMESHGUI/SMESHGUI_Make2DFrom3DOp.cxx b/src/SMESHGUI/SMESHGUI_Make2DFrom3DOp.cxx
index 73c54eb1c..125c5ae19 100644
--- a/src/SMESHGUI/SMESHGUI_Make2DFrom3DOp.cxx
+++ b/src/SMESHGUI/SMESHGUI_Make2DFrom3DOp.cxx
@@ -302,7 +302,7 @@ void SMESHGUI_Make2DFrom3DOp::selectionDone()
       bool isMesh = true;
       for ( int i = 0; i < ids.count() && isMesh; ++i )
       {
-        _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( ids[i].toLatin1().constData() );
+        _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( ids[i].toUtf8().constData() );
         mySrcMesh = SMESH::SObjectToInterface<SMESH::SMESH_Mesh>( sobj );  
         //isMesh = !mySrcMesh->_is_nil(); // EAP - it's sometimes necessary to copy to a new mesh
       }
@@ -355,7 +355,7 @@ bool SMESHGUI_Make2DFrom3DOp::isValid( QString& msg ) const
     for ( int i = 0; i < entries.count(); ++i )
     {
       SMESH::SMESH_GroupBase_var grp;
-      if ( _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toLatin1().constData() ))
+      if ( _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toUtf8().constData() ))
         grp = SMESH::SObjectToInterface<SMESH::SMESH_GroupBase>( sobj );
       if ( grp->_is_nil() ) {
         msg = tr( "SMESH_NOT_ONLY_GROUPS" );
@@ -369,7 +369,7 @@ bool SMESHGUI_Make2DFrom3DOp::isValid( QString& msg ) const
   for ( int i = 0; i < entries.count(); ++i )
   {
     SMESH::SMESH_IDSource_var idSource;
-    if ( _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toLatin1().constData() ))
+    if ( _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toUtf8().constData() ))
       idSource = SMESH::SObjectToInterface<SMESH::SMESH_IDSource>( sobj );
     if ( !idSource->_is_nil() ) {
       SMESH::array_of_ElementType_var types = idSource->GetTypes();
@@ -427,7 +427,7 @@ bool SMESHGUI_Make2DFrom3DOp::compute2DMesh( QStringList& theEntryList )
       groups->length( entries.count() );
       for ( int i = 0; i < entries.count(); ++i )
       {
-        _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toLatin1().constData() );
+        _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entries[i].toUtf8().constData() );
         SMESH::SMESH_IDSource_var grp = SMESH::SObjectToInterface<SMESH::SMESH_IDSource>( sobj );  
         SMESH::array_of_ElementType_var types = grp->GetTypes();
         if ( types->length() < 1 || types[0] != goodType )
@@ -450,8 +450,8 @@ bool SMESHGUI_Make2DFrom3DOp::compute2DMesh( QStringList& theEntryList )
       SMESH::SMESH_Group_var newGrp;
       SMESH::SMESH_Mesh_var newMesh;
       CORBA::Long nbAdded = aMeshEditor->MakeBoundaryElements( mode,
-                                                               groupName.toLatin1().constData(),
-                                                               meshName.toLatin1().constData(),
+                                                               groupName.toUtf8().constData(),
+                                                               meshName.toUtf8().constData(),
                                                                copyAll,
                                                                groups,
                                                                newMesh.out(),
@@ -468,7 +468,7 @@ bool SMESHGUI_Make2DFrom3DOp::compute2DMesh( QStringList& theEntryList )
       ok = true;
 
       for ( int i = 0; i < entries.count(); ++i )
-        if ( SMESH_Actor* actor = SMESH::FindActorByEntry( entries[i].toLatin1().constData() ))
+        if ( SMESH_Actor* actor = SMESH::FindActorByEntry( entries[i].toUtf8().constData() ))
           SMESH::Update(actor->getIO(),actor->GetVisibility());
       SMESH::RepaintCurrentView();
     }
diff --git a/src/SMESHGUI/SMESHGUI_MakeNodeAtPointDlg.cxx b/src/SMESHGUI/SMESHGUI_MakeNodeAtPointDlg.cxx
index cd5a89ff5..4892b9192 100644
--- a/src/SMESHGUI/SMESHGUI_MakeNodeAtPointDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_MakeNodeAtPointDlg.cxx
@@ -528,7 +528,7 @@ bool SMESHGUI_MakeNodeAtPointOp::onApply()
     if (aMeshEditor->_is_nil())
       return true;
 
-    aMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+    aMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
     bool ok;
     int anId = myDlg->myId->text().toInt( &ok );
diff --git a/src/SMESHGUI/SMESHGUI_MeshOp.cxx b/src/SMESHGUI/SMESHGUI_MeshOp.cxx
index f9f5ab83a..314eabf52 100644
--- a/src/SMESHGUI/SMESHGUI_MeshOp.cxx
+++ b/src/SMESHGUI/SMESHGUI_MeshOp.cxx
@@ -329,7 +329,7 @@ bool SMESHGUI_MeshOp::isSubshapeOk() const
 
   // mesh
   QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
-  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
+  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
   if (!pMesh) return false;
 
   SMESH::SMESH_Mesh_var mesh = SMESH::SObjectToInterface<SMESH::SMESH_Mesh>( pMesh );
@@ -354,7 +354,7 @@ bool SMESHGUI_MeshOp::isSubshapeOk() const
     QStringList::const_iterator aSubShapesIter = aGEOMs.begin();
     for ( ; aSubShapesIter != aGEOMs.end(); aSubShapesIter++) {
       QString aSubGeomEntry = (*aSubShapesIter);
-      _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toLatin1().data());
+      _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toUtf8().data());
       if (!pSubGeom) return false;
 
       GEOM::GEOM_Object_var aSubGeomVar =
@@ -416,7 +416,7 @@ char* SMESHGUI_MeshOp::isSubmeshIgnored() const
 
     QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
     QString aGeomEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
-    _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
+    _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
     if ( pMesh ) {
 
       QStringList algoNames;
@@ -428,11 +428,11 @@ char* SMESHGUI_MeshOp::isSubmeshIgnored() const
         if ( algo &&
              algo->InputTypes.empty() && // builds all dimensions it-self
              !algo->IsSupportSubmeshes )
-          return CORBA::string_dup( algoNames[0].toLatin1().data() );
+          return CORBA::string_dup( algoNames[0].toUtf8().data() );
       }
 
 //       GEOM::GEOM_Object_var geom;
-//       if (_PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() ))
+//       if (_PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() ))
 //         geom = SMESH::SObjectToInterface<GEOM::GEOM_Object>( pGeom );
 
 //       if ( !geom->_is_nil() && geom->GetShapeType() >= GEOM::FACE ) { // WIRE, EDGE as well
@@ -443,7 +443,7 @@ char* SMESHGUI_MeshOp::isSubmeshIgnored() const
           if ( algo &&
                algo->InputTypes.empty() && // builds all dimensions it-self
                !algo->IsSupportSubmeshes )
-            return CORBA::string_dup( algoNames[0].toLatin1().data() );
+            return CORBA::string_dup( algoNames[0].toUtf8().data() );
         }
 //       }
     }
@@ -461,8 +461,8 @@ _PTR(SObject) SMESHGUI_MeshOp::getSubmeshByGeom() const
 {
   QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
   QString aGeomEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
-  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
-  _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() );
+  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
+  _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() );
   if ( pMesh && pGeom ) {
     GEOM::GEOM_Object_var geom = SMESH::SObjectToInterface<GEOM::GEOM_Object>( pGeom );
     if ( !geom->_is_nil() ) {
@@ -522,7 +522,7 @@ void SMESHGUI_MeshOp::selectionDone()
 
     //Check geometry for mesh
     QString anObjEntry = myDlg->selectedObject(SMESHGUI_MeshDlg::Obj);
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID(anObjEntry.toLatin1().data());
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID(anObjEntry.toUtf8().data());
     if (pObj)
     {
       SMESH::SMESH_Mesh_var aMeshVar =
@@ -550,7 +550,7 @@ void SMESHGUI_MeshOp::selectionDone()
         int iSubSh = 0;
         for ( ; aSubShapesIter != aGEOMs.end(); aSubShapesIter++, iSubSh++) {
           QString aSubGeomEntry = (*aSubShapesIter);
-          _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toLatin1().data());
+          _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toUtf8().data());
          
           if( pSubGeom ) { 
             SALOMEDS_SObject* sobj = _CAST(SObject,pSubGeom);
@@ -566,7 +566,7 @@ void SMESHGUI_MeshOp::selectionDone()
       } else {
         // get geometry by selected sub-mesh
         QString anObjEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Obj );
-        _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+        _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
         GEOM::GEOM_Object_var aGeomVar = SMESH::GetShapeOnMeshOrSubMesh( pObj );
         if (!aGeomVar->_is_nil()) {
           aSeq->length(1);
@@ -693,12 +693,12 @@ void SMESHGUI_MeshOp::selectionDone()
         // enable/disable popup for choice of geom selection way
         bool enable = false;
         QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
-        if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() )) {
+        if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() )) {
           SMESH::SMESH_Mesh_var mesh = SMESH::SObjectToInterface<SMESH::SMESH_Mesh>( pMesh );
           if ( !mesh->_is_nil() ) {
             //rnv: issue 21056: EDF 1608 SMESH: Dialog Box "Create Sub Mesh": focus should automatically switch to geometry
             QString aGeomEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
-            _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() );
+            _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() );
             if ( !pGeom || GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() )->_is_nil() )
               myDlg->activateObject(SMESHGUI_MeshDlg::Geom);
             enable = ( shapeDim > 1 ) && ( mesh->NbEdges() > 0 );
@@ -773,7 +773,7 @@ bool SMESHGUI_MeshOp::isValid( QString& theMess ) const
   {
     QString aMeshEntry = myDlg->selectedObject
       ( myToCreate ? SMESHGUI_MeshDlg::Mesh : SMESHGUI_MeshDlg::Obj );
-    if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() )) {
+    if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() )) {
       SMESH::SMESH_Mesh_var mesh = SMESH::SObjectToInterface<SMESH::SMESH_Mesh>( pMesh );
       if ( !mesh->_is_nil() && CORBA::is_nil( mesh->GetShapeToMesh() )) {
         theMess = tr( "IMPORTED_MESH" );
@@ -802,7 +802,7 @@ bool SMESHGUI_MeshOp::isValid( QString& theMess ) const
       }
       return true;
     }
-    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() );
+    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() );
     if ( !pGeom || GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() )->_is_nil() )
     {
       theMess = tr( "GEOMETRY_OBJECT_IS_NULL" );
@@ -818,7 +818,7 @@ bool SMESHGUI_MeshOp::isValid( QString& theMess ) const
         theMess = tr( "MESH_IS_NOT_DEFINED" );
         return false;
       }
-      _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
+      _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
       if ( !pMesh || SMESH::SMESH_Mesh::_narrow( _CAST( SObject,pMesh )->GetObject() )->_is_nil() )
       {
         theMess = tr( "MESH_IS_NULL" );
@@ -945,7 +945,7 @@ void SMESHGUI_MeshOp::availableHyps( const int       theDim,
   QString aCurrentGeomToSelect;
   if ( !theMeshType.isEmpty() ) {
     aCurrentGeomToSelect = myDlg->selectedObject( myToCreate ? SMESHGUI_MeshDlg::Geom : SMESHGUI_MeshDlg::Obj );
-    if ( _PTR(SObject) so = SMESH::getStudy()->FindObjectID( aCurrentGeomToSelect.toLatin1().data() )) {
+    if ( _PTR(SObject) so = SMESH::getStudy()->FindObjectID( aCurrentGeomToSelect.toUtf8().data() )) {
       aGeomVar = SMESH::GetGeom( so );
     }
    if ( aCurrentGeomToSelect != myLastGeomToSelect )
@@ -1120,14 +1120,14 @@ SMESHGUI_MeshOp::getInitParamsHypothesis( const QString& aHypType,
   {
     anEntry = myDlg->selectedObject
       ( myToCreate ? SMESHGUI_MeshDlg::Mesh : SMESHGUI_MeshDlg::Obj );
-    if ( _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anEntry.toLatin1().data() ))
+    if ( _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anEntry.toUtf8().data() ))
     {
       CORBA::Object_ptr Obj = _CAST( SObject,pObj )->GetObject();
       if ( myToCreate ) // mesh and geom may be selected
       {
         aMeshVar = SMESH::SMESH_Mesh::_narrow( Obj );
         anEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
-        if ( _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( anEntry.toLatin1().data() ))
+        if ( _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( anEntry.toUtf8().data() ))
           aGeomVar= GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() );
       }
       else // edition: sub-mesh may be selected
@@ -1145,7 +1145,7 @@ SMESHGUI_MeshOp::getInitParamsHypothesis( const QString& aHypType,
     if ( !myToCreate ) // mesh to edit can be selected
     {
       anEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Obj );
-      if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( anEntry.toLatin1().data() ))
+      if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( anEntry.toUtf8().data() ))
       {
         aMeshVar = SMESH::SMESH_Mesh::_narrow( _CAST( SObject,pMesh )->GetObject() );
         if ( !aMeshVar->_is_nil() )
@@ -1154,7 +1154,7 @@ SMESHGUI_MeshOp::getInitParamsHypothesis( const QString& aHypType,
     }
     if ( aGeomVar->_is_nil() ) {
       anEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
-      if ( _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( anEntry.toLatin1().data() ))
+      if ( _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( anEntry.toUtf8().data() ))
       {
         aGeomVar= GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() );
       }
@@ -1162,14 +1162,14 @@ SMESHGUI_MeshOp::getInitParamsHypothesis( const QString& aHypType,
   }
 
   SMESH::SMESH_Hypothesis_var hyp =
-    SMESHGUI::GetSMESHGen()->GetHypothesisParameterValues( aHypType.toLatin1().data(),
-                                                           aServerLib.toLatin1().data(),
+    SMESHGUI::GetSMESHGen()->GetHypothesisParameterValues( aHypType.toUtf8().data(),
+                                                           aServerLib.toUtf8().data(),
                                                            aMeshVar,
                                                            aGeomVar,
                                                            /*byMesh = */isSubMesh);
   if ( hyp->_is_nil() && isSubMesh )
     hyp = SMESHGUI::GetSMESHGen()->GetHypothesisParameterValues( aHypType.toLatin1().data(),
-                                                                 aServerLib.toLatin1().data(),
+                                                                 aServerLib.toUtf8().data(),
                                                                  aMeshVar,
                                                                  aGeomVar,
                                                                  /*byMesh = */false);
@@ -1197,13 +1197,13 @@ void SMESHGUI_MeshOp::initHypCreator( SMESHGUI_GenericHypothesisCreator* theCrea
     aMeshEntry = aGeomEntry;
 
   if ( aMeshEntry != aGeomEntry ) { // Get Geom object from Mesh of a sub-mesh being edited
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
     GEOM::GEOM_Object_var aGeomVar = SMESH::GetShapeOnMeshOrSubMesh( pObj );
     aMeshEntry = ( aGeomVar->_is_nil() ) ? QString() : SMESH::toQStr( aGeomVar->GetStudyEntry() );
   }
 
   if ( aMeshEntry == "" && aGeomEntry == "" ) { // get geom of an object being edited
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
     bool isMesh;
     GEOM::GEOM_Object_var aGeomVar = SMESH::GetShapeOnMeshOrSubMesh( pObj, &isMesh );
     if ( !aGeomVar->_is_nil() )
@@ -1216,7 +1216,7 @@ void SMESHGUI_MeshOp::initHypCreator( SMESHGUI_GenericHypothesisCreator* theCrea
 
   if ( anObjEntry != "" && aGeomEntry != "" && aMeshEntry == "" ) {
     // take geometry from submesh being created
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
     if ( pObj ) {
       // if current object is sub-mesh
       SMESH::SMESH_subMesh_var aSubMeshVar =
@@ -1827,7 +1827,7 @@ bool SMESHGUI_MeshOp::createMesh( QString& theMess, QStringList& theEntryList )
   for ( int i = 0; it!=aList.end(); it++, ++i )
   {
     QString aGeomEntry = *it;
-    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() );
+    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() );
     GEOM::GEOM_Object_var aGeomVar =
       GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() );
 
@@ -1894,7 +1894,7 @@ bool SMESHGUI_MeshOp::createSubMesh( QString& theMess, QStringList& theEntryList
 
   // get mesh object
   QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
-  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() );
+  _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() );
   SMESH::SMESH_Mesh_var aMeshVar =
     SMESH::SMESH_Mesh::_narrow( _CAST( SObject,pMesh )->GetObject() );
   if (aMeshVar->_is_nil())
@@ -1914,7 +1914,7 @@ bool SMESHGUI_MeshOp::createSubMesh( QString& theMess, QStringList& theEntryList
   {
     //QString aGeomEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Geom );
     QString aGeomEntry = aGEOMs.first();
-    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toLatin1().data() );
+    _PTR(SObject) pGeom = SMESH::getStudy()->FindObjectID( aGeomEntry.toUtf8().data() );
     aGeomVar = GEOM::GEOM_Object::_narrow( _CAST( SObject,pGeom )->GetObject() );
   }
   else if (aGEOMs.count() > 1)
@@ -1934,7 +1934,7 @@ bool SMESHGUI_MeshOp::createSubMesh( QString& theMess, QStringList& theEntryList
         QStringList::const_iterator aSubShapesIter = aGEOMs.begin();
         for ( ; aSubShapesIter != aGEOMs.end(); aSubShapesIter++, iSubSh++) {
           QString aSubGeomEntry = (*aSubShapesIter);
-          _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toLatin1().data());
+          _PTR(SObject) pSubGeom = SMESH::getStudy()->FindObjectID(aSubGeomEntry.toUtf8().data());
           GEOM::GEOM_Object_var aSubGeomVar =
             GEOM::GEOM_Object::_narrow(_CAST(SObject,pSubGeom)->GetObject());
           TopAbs_ShapeEnum aSubShapeType = (TopAbs_ShapeEnum)aSubGeomVar->GetShapeType();
@@ -1959,7 +1959,7 @@ bool SMESHGUI_MeshOp::createSubMesh( QString& theMess, QStringList& theEntryList
           aNewGeomGroupName += aName;
           SALOMEDS::SObject_wrap aNewGroupSO =
             geomGen->AddInStudy( aGeomVar,
-                                 aNewGeomGroupName.toLatin1().data(), mainGeom);
+                                 aNewGeomGroupName.toUtf8().data(), mainGeom);
         }
       }
     }
@@ -1972,10 +1972,10 @@ bool SMESHGUI_MeshOp::createSubMesh( QString& theMess, QStringList& theEntryList
   SUIT_OverrideCursor aWaitCursor;
 
   // create sub-mesh
-  SMESH::SMESH_subMesh_var aSubMeshVar = aMeshVar->GetSubMesh( aGeomVar, aName.toLatin1().data() );
+  SMESH::SMESH_subMesh_var aSubMeshVar = aMeshVar->GetSubMesh( aGeomVar, aName.toUtf8().data() );
   _PTR(SObject) aSubMeshSO = SMESH::FindSObject( aSubMeshVar.in() );
   if ( aSubMeshSO ) {
-    SMESH::SetName( aSubMeshSO, aName.toLatin1().data() );
+    SMESH::SetName( aSubMeshSO, aName.toUtf8().data() );
     theEntryList.append( aSubMeshSO->GetID().c_str() );
   }
 
@@ -2124,7 +2124,7 @@ void SMESHGUI_MeshOp::setDefaultName( const QString& thePrefix ) const
   do
   {
     aResName = aPrefix + QString::number( i++ );
-    anObj = aStudy->FindObject( aResName.toLatin1().data() );
+    anObj = aStudy->FindObject( aResName.toUtf8().data() );
   }
   while ( anObj );
 
@@ -2229,7 +2229,7 @@ SMESH::SMESH_Hypothesis_var SMESHGUI_MeshOp::getAlgo( const int theDim )
 void SMESHGUI_MeshOp::readMesh()
 {
   QString anObjEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Obj );
-  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
   if ( !pObj )
     return;
 
@@ -2395,7 +2395,7 @@ bool SMESHGUI_MeshOp::editMeshOrSubMesh( QString& theMess )
     return false;
 
   QString anObjEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Obj );
-  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toLatin1().data() );
+  _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( anObjEntry.toUtf8().data() );
   if ( !pObj )
     return false;
 
@@ -2578,7 +2578,7 @@ void SMESHGUI_MeshOp::onGeomSelectionByMesh( bool theByMesh )
     }
     // set mesh object to SMESHGUI_ShapeByMeshOp and start it
     QString aMeshEntry = myDlg->selectedObject( SMESHGUI_MeshDlg::Mesh );
-    if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toLatin1().data() )) {
+    if ( _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( aMeshEntry.toUtf8().data() )) {
       SMESH::SMESH_Mesh_var aMeshVar =
         SMESH::SMESH_Mesh::_narrow( _CAST( SObject,pMesh )->GetObject() );
       if ( !aMeshVar->_is_nil() ) {
@@ -2607,7 +2607,7 @@ void SMESHGUI_MeshOp::onPublishShapeByMeshDlg(SUIT_Operation* op)
     if ( !aGeomVar->_is_nil() )
     {
       QString ID = SMESH::toQStr( aGeomVar->GetStudyEntry() );
-      if ( _PTR(SObject) aGeomSO = SMESH::getStudy()->FindObjectID( ID.toLatin1().data() )) {
+      if ( _PTR(SObject) aGeomSO = SMESH::getStudy()->FindObjectID( ID.toUtf8().data() )) {
         selectObject( aGeomSO );
         selectionDone();
       }
diff --git a/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx b/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
index 8b0bd227c..26ab55954 100755
--- a/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
@@ -475,7 +475,7 @@ bool SMESHGUI_MeshPatternDlg::onApply()
         aParameters << myNode1->text();
         if(myType == Type_3d )
           aParameters << myNode2->text();
-        myMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+        myMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
       }
       QList<int> ids;
       getIds(ids);
@@ -1149,7 +1149,7 @@ bool SMESHGUI_MeshPatternDlg::loadFromFile (const QString& theName)
   try {
     SMESH::SMESH_Pattern_var aPattern = SMESH::GetPattern();
 
-    if (!aPattern->LoadFromFile(theName.toLatin1().data()) ||
+    if (!aPattern->LoadFromFile(theName.toUtf8().data()) ||
         (myType == Type_2d && !aPattern->Is2D())) {
       SMESH::SMESH_Pattern::ErrorCode aCode = aPattern->GetErrorCode();
       QString aMess;
diff --git a/src/SMESHGUI/SMESHGUI_MeshUtils.cxx b/src/SMESHGUI/SMESHGUI_MeshUtils.cxx
index 0e322fc4a..0d5bfb73f 100644
--- a/src/SMESHGUI/SMESHGUI_MeshUtils.cxx
+++ b/src/SMESHGUI/SMESHGUI_MeshUtils.cxx
@@ -66,7 +66,7 @@ namespace SMESH
       theBaseName : theBaseName + "_" + thePostfix;
     if ( _PTR(Study) aStudy = getStudy() ) {
       QString name = baseName;
-      while ( !aStudy->FindObjectByName( name.toLatin1().data(), "SMESH" ).empty() ) {
+      while ( !aStudy->FindObjectByName( name.toUtf8().data(), "SMESH" ).empty() ) {
         int nb = 0;
         QStringList names = name.split("_", QString::KeepEmptyParts);
         if ( names.count() > 0 ) {
diff --git a/src/SMESHGUI/SMESHGUI_MultiEditDlg.cxx b/src/SMESHGUI/SMESHGUI_MultiEditDlg.cxx
index 2c0ae0eda..b3a43c861 100755
--- a/src/SMESHGUI/SMESHGUI_MultiEditDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_MultiEditDlg.cxx
@@ -1196,7 +1196,7 @@ bool SMESHGUI_UnionOfTrianglesDlg::process (SMESH::SMESH_MeshEditor_ptr theEdito
   {
     QStringList aParameters;
     aParameters << myMaxAngleSpin->text();
-    myMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+    myMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
   }
   SMESH::NumericalFunctor_var aCriterion = getNumericalFunctor();
   double aMaxAngle = myMaxAngleSpin->GetValue() * M_PI / 180.0;
@@ -1666,7 +1666,7 @@ bool SMESHGUI_SplitVolumesDlg::process (SMESH::SMESH_MeshEditor_ptr theEditor,
       aParameters << myDirSpin[0]->text();
       aParameters << myDirSpin[1]->text();
       aParameters << myDirSpin[2]->text();
-      myMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      myMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       SMESH::PointStruct_var point = new SMESH::PointStruct;
       point->x  = myPointSpin[0]->GetValue();
diff --git a/src/SMESHGUI/SMESHGUI_NodesDlg.cxx b/src/SMESHGUI/SMESHGUI_NodesDlg.cxx
index 5f2f2d921..fb44fa471 100644
--- a/src/SMESHGUI/SMESHGUI_NodesDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_NodesDlg.cxx
@@ -100,7 +100,7 @@ namespace SMESH
     try {
       _PTR(SObject) aSobj = SMESH::FindSObject( theMesh );
       SMESH::SMESH_MeshEditor_var aMeshEditor = theMesh->GetMeshEditor();
-      theMesh->SetParameters( theParameters.join(":").toLatin1().constData() );
+      theMesh->SetParameters( theParameters.join(":").toUtf8().constData() );
       aNodeId = aMeshEditor->AddNode( x, y, z );
       if (TVisualObjPtr aVisualObj = SMESH::GetVisualObj( aSobj->GetID().c_str() ) ) {
         aVisualObj->Update( true );
diff --git a/src/SMESHGUI/SMESHGUI_ReorientFacesDlg.cxx b/src/SMESHGUI/SMESHGUI_ReorientFacesDlg.cxx
index f6f72edb2..22bf3cf3a 100644
--- a/src/SMESHGUI/SMESHGUI_ReorientFacesDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ReorientFacesDlg.cxx
@@ -693,7 +693,7 @@ bool SMESHGUI_ReorientFacesOp::onApply()
       point.y = myDlg->myY->GetValue();
       point.z = myDlg->myZ->GetValue();
 
-      aMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      aMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       aResult = aMeshEditor->Reorient2D( myObject, direction, face, point );
     }
@@ -728,7 +728,7 @@ bool SMESHGUI_ReorientFacesOp::isValid( QString& msg )
 {
   // check object
   QString objectEntry = myDlg->selectedObject( EObject );
-  _PTR(SObject) pSObject = SMESH::getStudy()->FindObjectID( objectEntry.toLatin1().data() );
+  _PTR(SObject) pSObject = SMESH::getStudy()->FindObjectID( objectEntry.toUtf8().data() );
   myObject = SMESH::SMESH_IDSource::_narrow( _CAST( SObject,pSObject )->GetObject() );
   if ( myObject->_is_nil() )
   {
@@ -749,7 +749,7 @@ bool SMESHGUI_ReorientFacesOp::isValid( QString& msg )
   if ( myDlg->myConstructorGrp->checkedId() == CONSTRUCTOR_VOLUME )
   {
     objectEntry = myDlg->selectedObject( EVolumes );
-    _PTR(SObject) pSObject = SMESH::getStudy()->FindObjectID( objectEntry.toLatin1().data() );
+    _PTR(SObject) pSObject = SMESH::getStudy()->FindObjectID( objectEntry.toUtf8().data() );
     myVolumeObj = SMESH::SObjectToInterface< SMESH::SMESH_IDSource>( pSObject );
     if ( myVolumeObj->_is_nil() )
     {
diff --git a/src/SMESHGUI/SMESHGUI_RevolutionDlg.cxx b/src/SMESHGUI/SMESHGUI_RevolutionDlg.cxx
index f23c6d2f6..73d3991af 100644
--- a/src/SMESHGUI/SMESHGUI_RevolutionDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_RevolutionDlg.cxx
@@ -436,7 +436,7 @@ bool SMESHGUI_RevolutionDlg::ClickOnApply()
 
       SMESH::SMESH_Mesh_var mesh = SelectorWdg->GetMesh();
 
-      mesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      mesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       SMESH::ListOfIDSources_var nodes = new SMESH::ListOfIDSources();
       SMESH::ListOfIDSources_var edges = new SMESH::ListOfIDSources();
diff --git a/src/SMESHGUI/SMESHGUI_RotationDlg.cxx b/src/SMESHGUI/SMESHGUI_RotationDlg.cxx
index 291d908dd..d647c0244 100644
--- a/src/SMESHGUI/SMESHGUI_RotationDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_RotationDlg.cxx
@@ -446,13 +446,13 @@ bool SMESHGUI_RotationDlg::ClickOnApply()
         if(CheckBoxMesh->isChecked()) {
           for ( int i = 0; i < myObjects.count(); i++ ) {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->RotateObject(myObjects[i], anAxis, anAngle, false);
           }
         }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           aMeshEditor->Rotate(anElementsId, anAxis, anAngle, false);
         }
         break;
@@ -462,13 +462,13 @@ bool SMESHGUI_RotationDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked()) {
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               groups = aMeshEditor->RotateObjectMakeGroups(myObjects[i], anAxis, anAngle);
             }
           }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             groups = aMeshEditor->RotateMakeGroups(anElementsId, anAxis, anAngle);
           }
         }
@@ -476,13 +476,13 @@ bool SMESHGUI_RotationDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked()) {
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               aMeshEditor->RotateObject(myObjects[i], anAxis, anAngle, true);
             }
           }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->Rotate(anElementsId, anAxis, anAngle, true);
           }
         }
@@ -493,9 +493,9 @@ bool SMESHGUI_RotationDlg::ClickOnApply()
           for ( int i = 0; i < myObjects.count(); i++ ) {
             QString aName = SMESH::UniqueMeshName( LineEditNewMesh->text().replace( "*", myObjectsNames[i] ) );
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             mesh = aMeshEditor->RotateObjectMakeMesh(myObjects[i], anAxis, anAngle, makeGroups,
-                                                     aName.toLatin1().data());
+                                                     aName.toUtf8().data());
             if (!mesh->_is_nil()) {
               if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
                 anEntryList.append( aSObject->GetID().c_str() );
@@ -504,9 +504,9 @@ bool SMESHGUI_RotationDlg::ClickOnApply()
         }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           mesh = aMeshEditor->RotateMakeMesh(anElementsId, anAxis, anAngle, makeGroups,
-                                             LineEditNewMesh->text().toLatin1().data());
+                                             LineEditNewMesh->text().toUtf8().data());
           if (!mesh->_is_nil()) {
             if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
               anEntryList.append( aSObject->GetID().c_str() );
diff --git a/src/SMESHGUI/SMESHGUI_ScaleDlg.cxx b/src/SMESHGUI/SMESHGUI_ScaleDlg.cxx
index 001ee7d94..e86d61c80 100644
--- a/src/SMESHGUI/SMESHGUI_ScaleDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ScaleDlg.cxx
@@ -484,13 +484,13 @@ bool SMESHGUI_ScaleDlg::ClickOnApply()
         if ( CheckBoxMesh->isChecked() )
           for ( int i = 0; i < myObjects.count(); i++ ) {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters( aParameters.join( ":" ).toLatin1().constData() );
+            myMeshes[i]->SetParameters( aParameters.join( ":" ).toUtf8().constData() );
             aMeshEditor->Scale(myObjects[i], aPoint, aScaleFact, false);
           }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
           SMESH::IDSource_wrap src = aMeshEditor->MakeIDSource(anElementsId, SMESH::ALL);
-          myMeshes[0]->SetParameters( aParameters.join( ":" ).toLatin1().constData() );
+          myMeshes[0]->SetParameters( aParameters.join( ":" ).toUtf8().constData() );
           aMeshEditor->Scale( src, aPoint, aScaleFact, false);
         }
         break;
@@ -501,13 +501,13 @@ bool SMESHGUI_ScaleDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked())
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               groups = aMeshEditor->ScaleMakeGroups(myObjects[i], aPoint, aScaleFact);
             }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
             SMESH::IDSource_wrap src = aMeshEditor->MakeIDSource(anElementsId, SMESH::ALL);
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             groups = aMeshEditor->ScaleMakeGroups( src, aPoint, aScaleFact);
           }
         }
@@ -515,14 +515,14 @@ bool SMESHGUI_ScaleDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked()) {
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               aMeshEditor->Scale(myObjects[i], aPoint, aScaleFact, true);
             }
           }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
             SMESH::IDSource_wrap src = aMeshEditor->MakeIDSource(anElementsId, SMESH::ALL);
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->Scale( src, aPoint, aScaleFact, true);
           }
         }
@@ -534,19 +534,19 @@ bool SMESHGUI_ScaleDlg::ClickOnApply()
           for ( int i = 0; i < myObjects.count(); i++ ) {
             QString aName = SMESH::UniqueMeshName( LineEditNewMesh->text().replace( "*", myObjectsNames[i] ) );
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             mesh = aMeshEditor->ScaleMakeMesh(myObjects[i], aPoint, aScaleFact, makeGroups,
-                                              aName.toLatin1().data());
+                                              aName.toUtf8().data());
             if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
               anEntryList.append( aSObject->GetID().c_str() );
           }
         }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           SMESH::IDSource_wrap src = aMeshEditor->MakeIDSource(anElementsId, SMESH::ALL);
           mesh = aMeshEditor->ScaleMakeMesh( src, aPoint, aScaleFact, makeGroups,
-                                             LineEditNewMesh->text().toLatin1().data());
+                                             LineEditNewMesh->text().toUtf8().data());
           if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
             anEntryList.append( aSObject->GetID().c_str() );
         }
diff --git a/src/SMESHGUI/SMESHGUI_Selection.cxx b/src/SMESHGUI/SMESHGUI_Selection.cxx
index a8704b8b9..450fda119 100644
--- a/src/SMESHGUI/SMESHGUI_Selection.cxx
+++ b/src/SMESHGUI/SMESHGUI_Selection.cxx
@@ -198,7 +198,7 @@ QList<QVariant> SMESHGUI_Selection::elemTypes( int ind, bool fromObj ) const
   {
     if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
     {
-      _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+      _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
       CORBA::Object_var obj = SMESH::SObjectToObject( sobj );
       SMESH::SMESH_IDSource_var idSrc = SMESH::SMESH_IDSource::_narrow( obj );
       if ( !CORBA::is_nil( idSrc ) )
@@ -263,7 +263,7 @@ QString SMESHGUI_Selection::displayMode( int ind ) const
 
 bool SMESHGUI_Selection::isQuadratic( int ind ) const
 {
-  _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+  _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
   if ( !so )
     return false;
   SMESH::SMESH_IDSource_var idSource =  SMESH::SObjectToInterface<SMESH::SMESH_IDSource>( so );
@@ -465,7 +465,7 @@ bool SMESHGUI_Selection::isAutoColor( int ind ) const
 {
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
   {
-    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     CORBA::Object_var obj = SMESH::SObjectToObject( sobj );
 
     if ( !CORBA::is_nil( obj ) ) {
@@ -486,7 +486,7 @@ int SMESHGUI_Selection::numberOfNodes( int ind ) const
 {
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
   {
-    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     CORBA::Object_var obj = SMESH::SObjectToObject( sobj );
 
     if ( !CORBA::is_nil( obj ) ) {
@@ -517,7 +517,7 @@ int SMESHGUI_Selection::dim( int ind ) const
   int dim = -1;
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
   {
-    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     CORBA::Object_var obj = SMESH::SObjectToObject( sobj );
 
     if ( !CORBA::is_nil( obj ) ) {
@@ -552,7 +552,7 @@ bool SMESHGUI_Selection::isComputable( int ind ) const
                                               myTypes[ind].startsWith("Mesh " )))
   {
     QMap<int,int> modeMap;
-    _PTR(SObject) meshSO = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) meshSO = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
 
     _PTR(SComponent) component = meshSO->GetFatherComponent();
     if ( meshSO->Depth() - component->Depth() > 1 ) // sub-mesh, get a mesh
@@ -578,7 +578,7 @@ bool SMESHGUI_Selection::isPreComputable( int ind ) const
     if ( maxDim < 2 ) // we can preview 1D or 2D
     {
       QMap<int,int> modeMap;
-      _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+      _PTR(SObject) pMesh = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
       SMESHGUI_PrecomputeOp::getAssignedAlgos( pMesh, modeMap );
       if ( modeMap.size() > 1 )
         return (( modeMap.contains( SMESH::DIM_3D )) ||
@@ -597,7 +597,7 @@ bool SMESHGUI_Selection::hasGeomReference( int ind ) const
 {
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
   {
-    _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     GEOM::GEOM_Object_var shape = SMESH::GetShapeOnMeshOrSubMesh( so );
     return !shape->_is_nil();
   }
@@ -614,7 +614,7 @@ bool SMESHGUI_Selection::isEditableHyp( int ind ) const
   bool isEditable = true;
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] == "Hypothesis" )
   {
-    _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) so = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     SMESH::SMESH_Hypothesis_var hyp = SMESH::SObjectToInterface<SMESH::SMESH_Hypothesis>( so );
     if ( !hyp->_is_nil() )
     {
@@ -633,7 +633,7 @@ bool SMESHGUI_Selection::isVisible( int ind ) const
 {
   if ( ind >= 0 && ind < myTypes.count() && myTypes[ind] != "Unknown" )
   {
-    SMESH_Actor* actor = SMESH::FindActorByEntry( entry( ind ).toLatin1().data() );
+    SMESH_Actor* actor = SMESH::FindActorByEntry( entry( ind ).toUtf8().data() );
     if ( actor && actor->hasIO() ) {
       if ( SVTK_ViewWindow* aViewWindow = SMESH::GetCurrentVtkView() )
         return aViewWindow->isVisible( actor->getIO() );
@@ -651,7 +651,7 @@ bool SMESHGUI_Selection::hasChildren( int ind ) const
 {
   if ( ind >= 0 )
   {
-    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().data() );
     if ( sobj ) 
       return SMESH::getStudy()->GetUseCaseBuilder()->HasChildren( sobj );
   }
@@ -669,7 +669,7 @@ int SMESHGUI_Selection::nbChildren( int ind ) const
   if ( ind >= 0 )
   {
     _PTR(Study) study = SMESH::getStudy();
-    _PTR(SObject) sobj = study->FindObjectID( entry( ind ).toLatin1().data() );
+    _PTR(SObject) sobj = study->FindObjectID( entry( ind ).toUtf8().data() );
     if ( sobj && study->GetUseCaseBuilder()->IsUseCaseNode( sobj ) ) {
       _PTR(UseCaseIterator) it = study->GetUseCaseBuilder()->GetUseCaseIterator( sobj );
       for ( it->Init( false ); it->More(); it->Next() ) nb++;
@@ -696,7 +696,7 @@ bool SMESHGUI_Selection::isContainer( int ind ) const
 int SMESHGUI_Selection::type( const QString& entry )
 {
   int res = -1;
-  _PTR(SObject) obj = SalomeApp_Application::getStudy()->FindObjectID( entry.toLatin1().data() );
+  _PTR(SObject) obj = SalomeApp_Application::getStudy()->FindObjectID( entry.toUtf8().data() );
   if ( obj ) {
     _PTR(SObject) ref;
     if ( obj->ReferencedObject( ref ) )
@@ -792,7 +792,7 @@ QString SMESHGUI_Selection::typeName( const int t )
 bool SMESHGUI_Selection::isImported( const int ind ) const
 {
   bool res = false;
-  _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().constData() );
+  _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().constData() );
   if ( sobj )
   {
     SMESH::SMESH_Mesh_var aMesh = SMESH::SMESH_Mesh::_narrow( SMESH::SObjectToObject( sobj ) );
@@ -822,7 +822,7 @@ int SMESHGUI_Selection::guiState()
 
 QString SMESHGUI_Selection::groupType( int ind ) const
 {
-  _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toLatin1().constData() );
+  _PTR(SObject) sobj = SMESH::getStudy()->FindObjectID( entry( ind ).toUtf8().constData() );
   if ( sobj )
   {
     SMESH::SMESH_Group_var g = SMESH::SObjectToInterface<SMESH::SMESH_Group>( sobj );
diff --git a/src/SMESHGUI/SMESHGUI_SelectionOp.cxx b/src/SMESHGUI/SMESHGUI_SelectionOp.cxx
index ed560b87e..bbf493e35 100644
--- a/src/SMESHGUI/SMESHGUI_SelectionOp.cxx
+++ b/src/SMESHGUI/SMESHGUI_SelectionOp.cxx
@@ -304,7 +304,7 @@ int SMESHGUI_SelectionOp::typeById( const QString& str, const EntityType objtype
     if( t<0 )
     {
       //try to get GEOM type
-      _PTR( SObject ) sobj = aStudy->FindObjectID( str.toLatin1().data() );
+      _PTR( SObject ) sobj = aStudy->FindObjectID( str.toUtf8().data() );
       if( sobj )
       {
         GEOM::GEOM_Object_var obj = GEOM::GEOM_Object::_narrow(
@@ -327,7 +327,7 @@ int SMESHGUI_SelectionOp::typeById( const QString& str, const EntityType objtype
     int id = _id.toInt( &ok );
     if( ok )
     {
-      _PTR( SObject ) sobj = aStudy->FindObjectID( entry.toLatin1().data() );
+      _PTR( SObject ) sobj = aStudy->FindObjectID( entry.toUtf8().data() );
       SMESH::SMESH_Mesh_var mesh = SMESH::SMESH_Mesh::_narrow( 
         dynamic_cast<SALOMEDS_SObject*>( sobj.get() )->GetObject() );
       SMESH::SMESH_subMesh_var submesh = SMESH::SMESH_subMesh::_narrow( 
diff --git a/src/SMESHGUI/SMESHGUI_ShapeByMeshDlg.cxx b/src/SMESHGUI/SMESHGUI_ShapeByMeshDlg.cxx
index 5d82de8be..73d9727dc 100644
--- a/src/SMESHGUI/SMESHGUI_ShapeByMeshDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_ShapeByMeshDlg.cxx
@@ -314,7 +314,7 @@ void SMESHGUI_ShapeByMeshOp::commitOperation()
       // GEOM_Object is published -> no need to UnRegister()
       myGeomObj = GEOM::GEOM_Object::_duplicate
         (SMESHGUI::GetSMESHGen()->GetGeometryByMeshElement
-         ( myMesh.in(), elemID, myDlg->myGeomName->text().toLatin1().constData()) );
+         ( myMesh.in(), elemID, myDlg->myGeomName->text().toUtf8().constData()) );
     }
     else
     {
@@ -387,7 +387,7 @@ void SMESHGUI_ShapeByMeshOp::commitOperation()
       QString aNewGeomGroupName ( myDlg->myGeomName->text() );
       SALOMEDS::SObject_wrap aNewGroupSO =
         geomGen->AddInStudy( aGeomObject,
-                             aNewGeomGroupName.toLatin1().data(), aMeshShape);
+                             aNewGeomGroupName.toUtf8().data(), aMeshShape);
 
       // get a GEOM_Object already published, which doesn't need UnRegister()
       CORBA::Object_var obj = aNewGroupSO->GetObject();
diff --git a/src/SMESHGUI/SMESHGUI_SmoothingDlg.cxx b/src/SMESHGUI/SMESHGUI_SmoothingDlg.cxx
index 3f79c3292..5c27f3bd8 100644
--- a/src/SMESHGUI/SMESHGUI_SmoothingDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_SmoothingDlg.cxx
@@ -382,7 +382,7 @@ bool SMESHGUI_SmoothingDlg::ClickOnApply()
       SUIT_OverrideCursor aWaitCursor;
       SMESH::SMESH_MeshEditor_var aMeshEditor = myMesh->GetMeshEditor();
 
-      myMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
+      myMesh->SetParameters( aParameters.join(":").toUtf8().constData() );
 
       if ( CheckBoxParametric->isChecked() ) {
         if(CheckBoxMesh->isChecked())
diff --git a/src/SMESHGUI/SMESHGUI_SplitBiQuad.cxx b/src/SMESHGUI/SMESHGUI_SplitBiQuad.cxx
index 75e03affb..6bd868a80 100644
--- a/src/SMESHGUI/SMESHGUI_SplitBiQuad.cxx
+++ b/src/SMESHGUI/SMESHGUI_SplitBiQuad.cxx
@@ -202,7 +202,7 @@ bool SMESHGUI_SplitBiQuadOp::onApply()
   int nbObj = 0;
   for ( int i = 0; i < entries.count() ; ++i )
   {
-    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( entries[i].toLatin1().data() );
+    _PTR(SObject) pObj = SMESH::getStudy()->FindObjectID( entries[i].toUtf8().data() );
     SMESH::SMESH_IDSource_var obj = SMESH::SObjectToInterface<SMESH::SMESH_IDSource>( pObj );
     if( !CORBA::is_nil( obj ))
     {
diff --git a/src/SMESHGUI/SMESHGUI_SymmetryDlg.cxx b/src/SMESHGUI/SMESHGUI_SymmetryDlg.cxx
index f994189fd..873c8a4b8 100644
--- a/src/SMESHGUI/SMESHGUI_SymmetryDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_SymmetryDlg.cxx
@@ -512,12 +512,12 @@ bool SMESHGUI_SymmetryDlg::ClickOnApply()
         if(CheckBoxMesh->isChecked())
           for ( int i = 0; i < myObjects.count(); i++ ) {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->MirrorObject(myObjects[i], aMirror, aMirrorType, false );
           }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           aMeshEditor->Mirror(anElementsId, aMirror, aMirrorType, false );
         }
         break;
@@ -528,12 +528,12 @@ bool SMESHGUI_SymmetryDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked())
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               groups = aMeshEditor->MirrorObjectMakeGroups(myObjects[i], aMirror, aMirrorType);
             }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             groups = aMeshEditor->MirrorMakeGroups(anElementsId, aMirror, aMirrorType);
           }
         }
@@ -541,12 +541,12 @@ bool SMESHGUI_SymmetryDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked())
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               aMeshEditor->MirrorObject(myObjects[i], aMirror, aMirrorType, true);
             }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->Mirror(anElementsId, aMirror, aMirrorType, true);
           }
         }
@@ -558,17 +558,17 @@ bool SMESHGUI_SymmetryDlg::ClickOnApply()
           for ( int i = 0; i < myObjects.count(); i++ ) {
             QString aName = SMESH::UniqueMeshName( LineEditNewMesh->text().replace( "*", myObjectsNames[i] ) );
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             mesh = aMeshEditor->MirrorObjectMakeMesh(myObjects[i], aMirror, aMirrorType, makeGroups,
-                                                     aName.toLatin1().data());
+                                                     aName.toUtf8().data());
             if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
               anEntryList.append( aSObject->GetID().c_str() );
           }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           mesh = aMeshEditor->MirrorMakeMesh(anElementsId, aMirror, aMirrorType, makeGroups,
-                                             LineEditNewMesh->text().toLatin1().data());
+                                             LineEditNewMesh->text().toUtf8().data());
           if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
             anEntryList.append( aSObject->GetID().c_str() );
         }
diff --git a/src/SMESHGUI/SMESHGUI_TranslationDlg.cxx b/src/SMESHGUI/SMESHGUI_TranslationDlg.cxx
index 21342aebd..ecd742a77 100644
--- a/src/SMESHGUI/SMESHGUI_TranslationDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_TranslationDlg.cxx
@@ -520,12 +520,12 @@ bool SMESHGUI_TranslationDlg::ClickOnApply()
         if(CheckBoxMesh->isChecked())
           for ( int i = 0; i < myObjects.count(); i++ ) {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->TranslateObject(myObjects[i], aVector, false);
           }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           aMeshEditor->Translate(anElementsId, aVector, false);
         }
         break;
@@ -535,13 +535,13 @@ bool SMESHGUI_TranslationDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked()) {
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               groups = aMeshEditor->TranslateObjectMakeGroups(myObjects[i],aVector);
             }
           }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             groups = aMeshEditor->TranslateMakeGroups(anElementsId, aVector);
           }
         }
@@ -549,13 +549,13 @@ bool SMESHGUI_TranslationDlg::ClickOnApply()
           if(CheckBoxMesh->isChecked()) {
             for ( int i = 0; i < myObjects.count(); i++ ) {
               SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-              myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+              myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
               aMeshEditor->TranslateObject(myObjects[i], aVector, true);
             }
           }
           else {
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-            myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             aMeshEditor->Translate(anElementsId, aVector, true);
           }
         }
@@ -566,18 +566,18 @@ bool SMESHGUI_TranslationDlg::ClickOnApply()
           for ( int i = 0; i < myObjects.count(); i++ ) {
             QString aName = SMESH::UniqueMeshName( LineEditNewMesh->text().replace( "*", myObjectsNames[i] ) );
             SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[i]->GetMeshEditor();
-            myMeshes[i]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+            myMeshes[i]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
             mesh = aMeshEditor->TranslateObjectMakeMesh(myObjects[i], aVector, makeGroups,
-                                                        aName.toLatin1().data());
+                                                        aName.toUtf8().data());
             if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
               anEntryList.append( aSObject->GetID().c_str() );
           }
         }
         else {
           SMESH::SMESH_MeshEditor_var aMeshEditor = myMeshes[0]->GetMeshEditor();
-          myMeshes[0]->SetParameters(aParameters.join( ":" ).toLatin1().constData());
+          myMeshes[0]->SetParameters(aParameters.join( ":" ).toUtf8().constData());
           mesh = aMeshEditor->TranslateMakeMesh(anElementsId, aVector, makeGroups,
-                                                LineEditNewMesh->text().toLatin1().data());
+                                                LineEditNewMesh->text().toUtf8().data());
           if( _PTR(SObject) aSObject = SMESH::ObjectToSObject( mesh ) )
             anEntryList.append( aSObject->GetID().c_str() );
         }
diff --git a/src/SMESHGUI/SMESHGUI_Utils.cxx b/src/SMESHGUI/SMESHGUI_Utils.cxx
index e6fdb1c15..17d8b4302 100644
--- a/src/SMESHGUI/SMESHGUI_Utils.cxx
+++ b/src/SMESHGUI/SMESHGUI_Utils.cxx
@@ -135,7 +135,7 @@ namespace SMESH
   {
     if (getStudy()->GetProperties()->IsLocked())
       return;
-    SMESHGUI::GetSMESHGen()->SetName(theSObject->GetIOR().c_str(), theName.toLatin1().data());
+    SMESHGUI::GetSMESHGen()->SetName(theSObject->GetIOR().c_str(), theName.toUtf8().data());
   }
 
   void SetValue (_PTR(SObject) theSObject, const QString& theValue)
@@ -148,7 +148,7 @@ namespace SMESH
       aBuilder->FindOrCreateAttribute(theSObject, "AttributeComment");
     _PTR(AttributeComment) aComment = anAttr;
     if (aComment)
-      aComment->SetValue(theValue.toLatin1().data());
+      aComment->SetValue(theValue.toUtf8().data());
   }
   
   void setFileName (_PTR(SObject) theSObject, const QString& theValue)
@@ -161,7 +161,7 @@ namespace SMESH
       aBuilder->FindOrCreateAttribute(theSObject, "AttributeExternalFileDef");
     _PTR(AttributeExternalFileDef) aFileName = anAttr;
     if (aFileName)
-      aFileName->SetValue(theValue.toLatin1().data());
+      aFileName->SetValue(theValue.toUtf8().data());
   }
   
   void setFileType (_PTR(SObject) theSObject, const QString& theValue)
@@ -174,7 +174,7 @@ namespace SMESH
       aBuilder->FindOrCreateAttribute(theSObject, "AttributeFileType");
     _PTR(AttributeFileType) aFileType = anAttr;
     if (aFileType)
-      aFileType->SetValue(theValue.toLatin1().data());
+      aFileType->SetValue(theValue.toUtf8().data());
   }
 
   CORBA::Object_var SObjectToObject (_PTR(SObject) theSObject )
diff --git a/src/SMESH_SWIG_WITHIHM/libSMESH_Swig.cxx b/src/SMESH_SWIG_WITHIHM/libSMESH_Swig.cxx
index a5a5dfe01..7bab7fe59 100644
--- a/src/SMESH_SWIG_WITHIHM/libSMESH_Swig.cxx
+++ b/src/SMESH_SWIG_WITHIHM/libSMESH_Swig.cxx
@@ -96,7 +96,7 @@ namespace
       aDomainRoot = theStudyBuilder->NewObjectToTag(theSComponentMesh,theDomainRootTag);
       SALOMEDS::GenericAttribute_var anAttr = theStudyBuilder->FindOrCreateAttribute(aDomainRoot,"AttributeName");
       SALOMEDS::AttributeName_var aName = SALOMEDS::AttributeName::_narrow(anAttr);
-      aName->SetValue(theName.toLatin1().data());
+      aName->SetValue(theName.toUtf8().data());
       aName->UnRegister();
       anAttr = theStudyBuilder->FindOrCreateAttribute(aDomainRoot,"AttributePixMap");
       SALOMEDS::AttributePixMap_var aPixmap = SALOMEDS::AttributePixMap::_narrow(anAttr);
@@ -226,7 +226,7 @@ namespace
         SALOMEDS::GenericAttribute_var anAttr =
           theStudyBuilder->FindOrCreateAttribute(anAppliedDomainSO,"AttributeName");
         SALOMEDS::AttributeName_var aName = SALOMEDS::AttributeName::_narrow(anAttr);
-        aName->SetValue(theAppliedDomainMEN.toLatin1().data());
+        aName->SetValue(theAppliedDomainMEN.toUtf8().data());
         aName->UnRegister();
         anAttr = theStudyBuilder->FindOrCreateAttribute(anAppliedDomainSO,"AttributeSelectable");
         SALOMEDS::AttributeSelectable_var aSelAttr = SALOMEDS::AttributeSelectable::_narrow(anAttr);
@@ -551,7 +551,7 @@ const char* SMESH_Swig::AddSubMesh(const char* theMeshEntry,
       aSubMeshesRoot = myStudyBuilder->NewObjectToTag(aMeshSO,aShapeTag);
       anAttr = myStudyBuilder->FindOrCreateAttribute(aSubMeshesRoot,"AttributeName");
       SALOMEDS::AttributeName_var aName = SALOMEDS::AttributeName::_narrow(anAttr);
-      aName->SetValue(aSubMeshName.toLatin1().data());
+      aName->SetValue(aSubMeshName.toUtf8().data());
       aName->UnRegister();
       anAttr = myStudyBuilder->FindOrCreateAttribute(aSubMeshesRoot,"AttributeSelectable");
       SALOMEDS::AttributeSelectable_var aSelAttr = SALOMEDS::AttributeSelectable::_narrow(anAttr);
diff --git a/src/StdMeshersGUI/StdMeshersGUI_CartesianParamCreator.cxx b/src/StdMeshersGUI/StdMeshersGUI_CartesianParamCreator.cxx
index 88ea48899..e016bb1ea 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_CartesianParamCreator.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_CartesianParamCreator.cxx
@@ -1080,7 +1080,7 @@ QString StdMeshersGUI_CartesianParamCreator::storeParams() const
   try
   {
     if( isCreation() )
-      SMESH::SetName( SMESH::FindSObject( h ), myName->text().toLatin1().constData() );
+      SMESH::SetName( SMESH::FindSObject( h ), myName->text().toUtf8().constData() );
 
     // threshold
     h->SetVarParameter( myThreshold->text().toLatin1().constData(), "SetSizeThreshold" );
@@ -1109,7 +1109,7 @@ QString StdMeshersGUI_CartesianParamCreator::storeParams() const
     params << myPointSpin[0]->text();
     params << myPointSpin[1]->text();
     params << myPointSpin[2]->text();
-    h->SetVarParameter( params.join(":").toLatin1().constData(), "SetFixedPoint" );
+    h->SetVarParameter( params.join(":").toUtf8().constData(), "SetFixedPoint" );
     params.clear();
 
     SMESH::PointStruct ps;
@@ -1126,7 +1126,7 @@ QString StdMeshersGUI_CartesianParamCreator::storeParams() const
       params << spins[ax][1]->text();
       params << spins[ax][2]->text();
     }
-    h->SetVarParameter( params.join(":").toLatin1().constData(), "SetAxesDirs" );
+    h->SetVarParameter( params.join(":").toUtf8().constData(), "SetAxesDirs" );
 
     SMESH::DirStruct axDir[3];
     for ( int ax = 0; ax < 3; ++ax )
diff --git a/src/StdMeshersGUI/StdMeshersGUI_LayerDistributionParamWdg.cxx b/src/StdMeshersGUI/StdMeshersGUI_LayerDistributionParamWdg.cxx
index 9f1de0c28..4604833ed 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_LayerDistributionParamWdg.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_LayerDistributionParamWdg.cxx
@@ -167,7 +167,7 @@ void StdMeshersGUI_LayerDistributionParamWdg::onHypTypePopup( QAction* a )
   QString aServLib = aHypData->ServerLibName;
   QString aHypType = aHypData->TypeName;
   try {
-    set( gen->CreateHypothesis(aHypType.toLatin1().data(), aServLib.toLatin1().data()));
+    set( gen->CreateHypothesis(aHypType.toLatin1().data(), aServLib.toUtf8().data()));
   }
   catch (const SALOME::SALOME_Exception & S_ex) {
     SalomeApp_Tools::QtCatchCorbaException(S_ex);
diff --git a/src/StdMeshersGUI/StdMeshersGUI_NbSegmentsCreator.cxx b/src/StdMeshersGUI/StdMeshersGUI_NbSegmentsCreator.cxx
index 0d095e26b..35fdefcfa 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_NbSegmentsCreator.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_NbSegmentsCreator.cxx
@@ -379,16 +379,16 @@ bool StdMeshersGUI_NbSegmentsCreator::storeParamsToHypo( const NbSegmentsHypothe
   try
   {
     if( isCreation() )
-      SMESH::SetName( SMESH::FindSObject( h ), h_data.myName.toLatin1().data() );
+      SMESH::SetName( SMESH::FindSObject( h ), h_data.myName.toUtf8().data() );
 
-    h->SetVarParameter( h_data.myNbSegVarName.toLatin1().constData(), "SetNumberOfSegments" );
+    h->SetVarParameter( h_data.myNbSegVarName.toUtf8().constData(), "SetNumberOfSegments" );
     h->SetNumberOfSegments( h_data.myNbSeg );
     
     int distr = h_data.myDistrType;
     if ( distr == 0 )
       h->SetDistrType( distr ); // this is actually needed at non-uniform -> uniform switch
     if( distr==1 ) {
-      h->SetVarParameter( h_data.myScaleVarName.toLatin1().constData(), "SetScaleFactor" );
+      h->SetVarParameter( h_data.myScaleVarName.toUtf8().constData(), "SetScaleFactor" );
       h->SetScaleFactor( h_data.myScale );
     }
     if( distr==2 || distr==3 )
@@ -403,7 +403,7 @@ bool StdMeshersGUI_NbSegmentsCreator::storeParamsToHypo( const NbSegmentsHypothe
       h->SetTableFunction( h_data.myTable );
 
     if( distr==3 )
-      h->SetExpressionFunction( h_data.myExpr.toLatin1().data() );
+      h->SetExpressionFunction( h_data.myExpr.toUtf8().data() );
     //setting of function must follow after setConversionMode, because otherwise
     //the function will be checked with old conversion mode, so that it may occurs
     //unexpected errors for user
diff --git a/src/StdMeshersGUI/StdMeshersGUI_QuadrangleParamWdg.cxx b/src/StdMeshersGUI/StdMeshersGUI_QuadrangleParamWdg.cxx
index c608923bd..42c6ac2b9 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_QuadrangleParamWdg.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_QuadrangleParamWdg.cxx
@@ -249,7 +249,7 @@ QString  StdMeshersGUI_QuadrangleParamCreator::storeParams() const
 
   // name
   if( myName )
-    SMESH::SetName( SMESH::FindSObject( h ), myName->text().toLatin1().constData() );
+    SMESH::SetName( SMESH::FindSObject( h ), myName->text().toUtf8().constData() );
 
   // transition
   h->SetQuadType( StdMeshers::QuadType( myTypeWdg->GetType()) );
diff --git a/src/StdMeshersGUI/StdMeshersGUI_StdHypothesisCreator.cxx b/src/StdMeshersGUI/StdMeshersGUI_StdHypothesisCreator.cxx
index 72ed9ba54..a3d42ddad 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_StdHypothesisCreator.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_StdHypothesisCreator.cxx
@@ -467,7 +467,7 @@ QString StdMeshersGUI_StdHypothesisCreator::storeParams() const
   bool res = getStdParamFromDlg( params );
   if( isCreation() )
   {
-    SMESH::SetName( SMESH::FindSObject( hypothesis() ), params[0].myValue.toString().toLatin1().data() );
+    SMESH::SetName( SMESH::FindSObject( hypothesis() ), params[0].myValue.toString().toUtf8().data() );
     params.erase( params.begin() );
   }
 
diff --git a/src/StdMeshersGUI/StdMeshersGUI_SubShapeSelectorWdg.cxx b/src/StdMeshersGUI/StdMeshersGUI_SubShapeSelectorWdg.cxx
index a3a54de51..017d77876 100644
--- a/src/StdMeshersGUI/StdMeshersGUI_SubShapeSelectorWdg.cxx
+++ b/src/StdMeshersGUI/StdMeshersGUI_SubShapeSelectorWdg.cxx
@@ -578,7 +578,7 @@ void StdMeshersGUI_SubShapeSelectorWdg::updateState()
 GEOM::GEOM_Object_var StdMeshersGUI_SubShapeSelectorWdg::GetGeomObjectByEntry( const QString& theEntry )
 {
   GEOM::GEOM_Object_var aGeomObj;
-  SALOMEDS::SObject_var aSObj = SMESH_Gen_i::getStudyServant()->FindObjectID( theEntry.toLatin1().data() );
+  SALOMEDS::SObject_var aSObj = SMESH_Gen_i::getStudyServant()->FindObjectID( theEntry.toUtf8().data() );
   if (!aSObj->_is_nil() )
   {
     CORBA::Object_var obj = aSObj->GetObject();