Make sure that you files are not m3u files. If they are they are only plalist reference files, and the files you need are mp3. If you "explored" as Birdy said you should have found the folder with the mp3s in it.
Another way to explain this is in the thread:
http://www.gnutellaforums.com/showth...threadid=27006
A word of warning. On No account use the delete function on files in the Limewire Library, unless you never want to see or hear them again ever. They will be instantly deleted from your had drive without going to the trash/recycle bin.