Several years ago I my employer would do a network scan on our hard drives to search for MP3 files (not allowed). This was at the height of file sharing. I still wanted to have music on my computer so I simple changed the extension on most of my music from .mp3 to .mov and they because faux quicktime movies. The network scan could not find them anymore. Itunes and my Ipod has read these files for the last 4 years just fine (with the wrong extension). As of recently I noticed that these files are no longer playable in Itunes... Quicktime... Garageband... etc. Even if I copy the files and change the extension back to MP3... they are all just messed up somehow... I am not sure how long ago it happened because it is mostly on my older music. The files are still the correct file size for an MP3 song so I know that there is probably a way to fix this. Anyone have any fix? I can email you one of the jacked files to see if you can get it to play if that helps.