Out side the program, by that do you mean not in Magix Music Maker rather other audio player? if so read below:
To listen any audio file such as wav, mp3, aac etc you got to use audio player such as Windows Media Player, Real Player or any other.. Open player click on file, open then browse computer where your audio file is saved.
If your audio player is already set as a default player it could play your audio files other than Magix Music Maker.