It shouldnt matter what program the mp3s are associated with, but if the mp3s are set to read only the rio might not like it. If you did a backup of your mp3s onto cdrom and them put them back on the pc most cd burner progs make all the files on the disk read only. If they are you can just select all of them in win explorer and right click and unchck read only, this way you can do them all at once. I hope this helps.

Ben