I had a few songs backed up to a dvd using the roxio software; i'm not sure what they did but when i attempted to place the songs onto my computer again they were all transferred but i'm unable to play them. The error message I get is:"The file you are attempting to play has an extension which does not match the file format". The extension as displayed in Windows Explorer is "MP3 Format Sound" - is this a valid file type? Is there anyway to convert it back to mp3? Is it possible to save any of the files because as of now nothing plays - it's roughly 9.5 gigs.