I have used two GUIDs to open the folders My Computer and My Documents.
Process.Start(\"iexplore.exe\", \"::{20d04fe0-3aea-1069-a2d8-08002b
Better still would be to skip explorer entirely and just "start" the GUIDs directly:
explorer
Process.Start("::{20d04fe0-3aea-1069-a2d8-08002b30309d}");...
Process.Start("::{20d04fe0-3aea-1069-a2d8-08002b30309d}");