Open mp3-email-attachment by default with jit.qt.movie?

Romain Becker's icon

Hallo,
I am sorry, I can't figure out how to handle this. Don't even find the path of the e-mail attachment, neither the possibility of using a max-application as default application to play the files directly when opening the mail .
I am on Mac OS X ( 10.5.8).

Maybe someone can help and can tell me where to look for!?
Thanks,
Romain