FC 8 has something called codec buddy
which will help you open media files. Some codecs are free and others are not.
Try to open the file from Totem Media Player and Totem didn't find the codec then it'll lunch Codec Buddy and let you download codecs. MP3 codec is free but MPEG is not.
Here is a good guide:http://totallybeginner.blogspot.com/...1_archive.html