mp4a conversion

is there a free converter somewhere

my friend just sent me a raw version of a song he wants me to help work on. problem is he sent it in an mp4a format. does anyone know of a free conversion app that can convert an mp4a into an mp3 or wav? i use a pc w/xp home sp2.

thanx

If you have www.dbpoweramp.com, there is a codec for this format, http://www.dbpoweramp.com/codec-central.htm