Video file based on the Microsoft Advanced Systems Format (ASF) container format and compressed with Windows Media compression; similar to an .ASF file and contains video encoded with one of Microsoft's Windows Media Video (WMV) proprietary codecs.
Microsoft Windows Media Player 9 was the last version of the Windows Media Player developed for Mac OS X. However, Mac users can use Flip4Mac WMV (also known as Microsoft Windows Media Components for QuickTime) to play WMV files.
NOTE: Windows Media Audio (WMA) files are saved with a .WMA extension.