Public Function FileOpenDialogExt( _
   ByVal AllowMultiSelect As Boolean, _
   ByVal DefaultExt As String, _
   ByVal Filter As String, _
   ByVal InitialDir As String _
) As IAgUiFileOpenExt

public IAgUiFileOpenExt FileOpenDialogExt(
   bool AllowMultiSelect, 
   string DefaultExt, 
   string Filter, 
   string InitialDir
);

public: IAgUiFileOpenExt^ FileOpenDialogExt(
   bool AllowMultiSelect, 
   String __gc ^ DefaultExt, 
   String __gc ^ Filter, 
   String __gc ^ InitialDir
);

public IAgUiFileOpenExt fileOpenDialogExt(
   bool AllowMultiSelect, 
   String DefaultExt, 
   String Filter, 
   String InitialDir
);

public: HRESULT FileOpenDialogExt(
   VARIANT_BOOL AllowMultiSelect, 
   BSTR DefaultExt, 
   BSTR Filter, 
   BSTR InitialDir, 
   IAgUiFileOpenExt ** ReturnValue
);