Windows Media Player - a multimedia audio and video player bundled with the Windows Operating System. The player can play many different formats natively including WAV, ASF, WMF, MPEG-1 and can play many types of AVI files if the codec is installed including Divx. WMP can also play MPEG-2 with a third party codec installed (like the ones installed by software DVD players such as WinDVD and PowerDVD). MS Info