Windows Media Audio 9 Lossless is an audio codec for lossless compression by Microsoft, presented in early 2003. The latest version for 2008 is 9.2.
Compressed by this codec audio CD takes from 206 to 411 MB with a bitrate of audio files from 470 kbps to 1.08 Mbps. The codec is part of the Windows Media package, uses the .wma file extension, supports 6 discrete channels. Officially released only for Windows and Mac OS X. Google.