Hi! Help please! I'm a newbie and trying to work stuff out for myself ... but I can't work out what I'm doing wrong here!

I've downloaded a couple of Spanish audio books and when I try to launch them, the error message says:

c:\(my shared location)\[Edit]filename.mp3. The file type is not recognised

Help!

I've downloaded a few tunes so far and they seem fine. What can I do to listen & copy them for my home cd player?! Thanks in advance for your help!