diff --git a/src/SMESHGUI/SMESHGUI_Meshio.cxx b/src/SMESHGUI/SMESHGUI_Meshio.cxx
index 131d7cb77..fd3d99509 100644
--- a/src/SMESHGUI/SMESHGUI_Meshio.cxx
+++ b/src/SMESHGUI/SMESHGUI_Meshio.cxx
@@ -133,37 +133,37 @@ const QStringList& SMESHGUI_Meshio::GetExportFileFilter()
 {
   static const QStringList filter = {
     "Abaqus (*.inp)",
-    //"ANSYS msh (*.msh)",
+    //"ANSYS msh (*.msh)", // meshio KeyError: "Illegal ANSYS cell type 'line' 
     "AVS-UCD (*.avs)",
-    //"CGNS (*.cgns)",
+    //"CGNS (*.cgns)", // meshio IndexError: index 2 is out of bounds for axis 1 with size 2
     "DOLFIN XML (*.xml)",
 #if !defined(WIN32)
     "Exodus (*.e *.exo)",
 #endif
-    "FLAC3D (*.f3grid)",
+    //"FLAC3D (*.f3grid)", // meshio IndexError: Replacement index 3 out of range for positional args tuple
     "Gmsh 2.2 (*.msh)",
     //"Gmsh 4.0, and 4.1 (*.msh)",
-    //"H5M (*.h5m)",
+    //"H5M (*.h5m)", // meshio AttributeError: 'list' object has no attribute 'items'
     "Kratos/MDPA (*.mdpa)",
     "MED/Salome (*.med)",
     "Medit (*.mesh *.meshb)",
     "Nastran (*.bdf *fem *.nas)",
     "Netgen(*.vol *.vol.gz)",
-    "OBJ (*.obj)",
+    // "OBJ (*.obj)", // meshio._exceptions.WriteError: Wavefront .obj files can only contain triangle or quad cells 
 #if !defined(WIN32)
     "OFF (*.off)",
 #endif
     "PERMAS (*.post *.post.gz *.dato *.dato.gz)",
-    //"PLY (*.ply)",
+    //"PLY (*.ply)", // Export Warning: PLY doesn't support 64-bit integers. Casting down to 32-bit. Then import failed
     "STL (*.stl)",
-    //"SU2 (*.su2)",
-    //"SVG, 2D output only (*.svg)",
-    //"Tecplot (*.dat)",
-    //"TetGen (*.node *.ele)",
-    //"UGRID (*.ugrid)",
+    //"SU2 (*.su2)", // meshio TypeError: cannot unpack non-iterable CellBlock object
+    //"SVG, 2D output only (*.svg)", // meshio._exceptions.WriteError: SVG can only handle flat 2D meshes
+    //"Tecplot (*.dat)",  // meshio ValueError: need at least one array to concatenate
+    //"TetGen (*.node *.ele)", // never returns from meshio convert command
+    //"UGRID (*.ugrid)", // meshio AttributeError: 'list' object has no attribute 'reshape'
     "VTK (*.vtk)",
     "VTU (*.vtu)",
-    //"WKT, TIN (*.wkt)",
+    //"WKT, TIN (*.wkt)", // Export Warning: WTK only supports triangle cells. Skipping {", ".join(skip)} then import failed
     "XDMF (*.xdmf *.xmf)"
   };
 
diff --git a/test/SMESH_MeshioShapes.py b/test/SMESH_MeshioShapes.py
index 077f40793..c5c31b61f 100644
--- a/test/SMESH_MeshioShapes.py
+++ b/test/SMESH_MeshioShapes.py
@@ -116,7 +116,7 @@ def file_extensions():
         '.nas',
         # '.node', # never returns from meshio convert command
         # '.obj', # meshio._exceptions.WriteError: Wavefront .obj files can only contain triangle or quad cells
-        # '.off', # failed on Windows only
+        '.off', # failed on Windows only
         # '.ply', # Export Warning: PLY doesn't support 64-bit integers. Casting down to 32-bit. Then import failed
         '.post',
         '.post.gz',
@@ -134,7 +134,7 @@ def file_extensions():
         '.xml'
     ]
     if platform.system() == 'Windows':
-        extensions = [ext for ext in extensions if not ext in ['.e', '.exo']] # needs to be digged out - presumably an issue about encoding.
+        extensions = [ext for ext in extensions if not ext in ['.e', '.exo', '.off']] # needs to be digged out - presumably an issue about encoding.
 
     return extensions