file extension MPC

File extension MPC description:

Musepack is a purely variable bitrate codec and does not work at a constant bitrate. A big part of Musepack's quality comes from its highly variable bitrate handling which results in low bitrate for less demanding regions of the audio data and higher bitrate where it's needed. This allows MPC files to be as small as possible and not lose any valuable bits like encoders that work at a constant bitrate. After all, the purpose of a lossy audio encoder is to provide the highest possible quality at the lowest possible file size, and Musepack represents progress, as opposed to old, suboptimal legacy methods.

Audio file format like MP3. To play, try use some plug-in for your player eg. MusePack Winamp Plugin.
www.rarewares.org/mpc.html
File extension mpc replaces old file format with file extension MP+.