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

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