WMV codec compatibility

Video and audio encoded with Windows Media series 9 codecs should play back on most Windows PCs. Certain older PCs might encounter problems, depending on their version of Windows Media Player.

By default, Windows 2000 is installed with Windows Media Player 6.4. Windows ME is installed with version 7 and Windows XP is installed with version 8.

	Codec	Behavior
	Windows Media Video 9	Plays in Windows Media Player 6.4 and later. However, the codec is not installed by default with this version of the player - it will try to automatically find and download it via the internet.
	Windows Media Video 9 Screen	Plays in Windows Media Player 7 and later. Does not play in Windows Media Player 6.4. Codec downloads automatically in Windows Media Player 7 and later. Windows Media Player 6.4 cannot find the codec.
	Windows Media Audio 9	Constant bit rate: Plays in Windows Media Player 6.4 and later. Variable bit rate: Plays in Windows Media Player 7 and later. Errors or silence in Windows Media Player 6.4.
	Windows Media Audio 9 Professional	Plays in Windows Media Player 7 and later. Codec downloads automatically in Windows Media Player 7 and later. Windows Media Player 6.4 cannot find the codec.