This may be a totally ridiculous request but... I have about 97% of my library in iTunes as ACC files. The other 3% are my more popular songs that I have recently ripped into iTunes and saved as mp3 files. Is there a way to convert them to ACC and also make the ACC files replace the mp3 files in playlists? Have no idea what songs are in what playlists and I don't want to go through about 100 songs to figure it out.