VisualBoyAdvance-M

Hey guys,
I´m new over here.
So ist just want to try to explain my problem.

So as I say my MacBook, open roms normally with VisualBoyAdvance, it open the Rom if i doubleklick on it.
BUT if i start the App and want to start a Rom or a saved game with the way off:
Start Rom/App -> File > Open.. or ...