Public Sub AddFileExtension( _
    ByVal FileExt As String _
)

public void AddFileExtension(
    string FileExt
);

public: void AddFileExtension(
    String __gc ^ FileExt
);

public: HRESULT AddFileExtension(
    BSTR FileExt
);

public void addFileExtension(
    String FileExt
);

def AddFileExtension(self, FileExt:str) -> None: