Google can help you.
by oldermen74 - 5/29/06 5:06 PM
In Reply to: Switching from ipod to Creative Zen Vision M, but how??? by troganig
I don't know of a specific converter for that file type, but I've used audio converters before, and although it can take a while for your whole library, you can just queue everythig up and the converter should be able to take care of things for you.
My recommendations for finding an appropriate converter: http://www.google.com/search?hs=IXW&hl=en&lr=&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=mp4+to+mp3+converter+audio&btnG=Search