If you are using the Windows 7 Beta version, then you might need the codec pack for player video formats which are not natively supported on Windows Media Player. The Windows 7 Codec pack includes the native H264 playback in WMP12 and Media Center and also DXVA accelerated H264 playback is provided by the codec package for all other players. The Windows 7 Code pack supports 18 languages. The default is English and the installer includes support for the following other languages; Chinese Simplified/Traditional, Japanese, Czech, Dutch, Finnish, French, German, Greek, Italian, Norwegian, Portuguese, Russian, Spanish, Polish, Swedish and Turkish.
The installer will automatically remove most other popular codec releases from your computer before installing this concise yet comprehensive package. You won’t need to make any adjustments or tweaks to enjoy your media content immediately. Windows Media Player and Media Center will instantly recognize all your files as playable.
It does not contain a media player and it does not associate file-types. With this package installed you will be able to use any media player.