M4U is a file type ( sorry about being so vague )
Someone extracted the audio from a concert DVD and forwarded a RAR file, and all the songs were M4U instead of MP3.
I can play on my PC, using a DIVX player, but I would like to put songs on CD to listen to in the car. That's where I listen mostly.
Ooops, maybe it's M4A --- it's on my home PC