What format of audio files are supported?? I tried to add a few mp3's but they will not play.
The audio files supported depend on the operating system and possibly the codecs installed. We can't really offer a list of supported formats.
Which operating system are you using? If Windows, which version?
I am usiong vista64.
To find out what files are supported, create a debug log and read it, how to do so is covered in FAQ.
Can you find some MP3 files which actually do play, or none of MP3 files play? Did they show up in the media list if you selected "Audio files" or "All files"?