Set up the Playback Plug-Ins
Media Center supports playback of many of the popular media file types through input plug-ins included in the default installation. If you want to play other kinds of files supported by the program, you can download additional input plug-ins, as you need them. See Plug-in Manager for more information.
Media Center supports additional formats, including RealNetworks® RealPlayer® and QuickTime for playback. For the greatest range of media file support, make sure you have these players installed.