Uncompressed (raw) digital audio file; a direct representation of the digital sample values (1s and 0s) of an audio recording; also used in .WAV and .AIF files
Program(s) that open pcm files
Mac: Apple QuickTime Player Windows: Apple QuickTime Player; Cool Edit Pro; Adobe Audition
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/pcm