Audio does not play correctly when you use a video playback application other than Windows Media Center to open a .wtv file on a Windows Vista-based computer that has Windows Media Center TV Pack installed
On a Windows Vista-based computer, you have Windows Media Center TV Pack for Windows Vista installed. When you use a video playback application other than Windows Media Center to open a Windows Media Center TV recording (.wtv) file that contains more than one recorded audio track, the audio may not be played. Or, the wrong audio track may be played by the application.
This problem may also occur if you burn the .wtv recording file as video to a CD or to a DVD and then try to play the video disc.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB968957.