Try changing the extension to .mpg
Quote
-----------------------------------------------------------------
Microsoft Digital Video Recording (.dvr-ms)
In Microsoft Windows XP Media Center Edition, Microsoft introduced the *.dvr-ms file format for storing recorded TV content. Similar to *.asf files, *.dvr-ms file enhancements permit key Personal Video Recorder (PVR) functionality, including time-shifting, live pause, and simultaneous record and playback. Video contained in a *.dvr-ms file is encoded as MPEG-2 video stream, and the audio contained in the *.dvr-ms file is encoded as MPEG-1 Layer II audio stream.
To play back unprotected *.dvr-ms files on Windows XP-based computers, you must have the following software and hardware components:
• Microsoft Windows XP Service Pack 1 (SP1) or later.
• The update that is documented in the following article in the Microsoft Knowledge Base must be installed on the computer: For more information, click the following article number to view the article in the Microsoft Knowledge Base:
810243 DirectShow playback support for files recorded with Windows XP Media Center Edition
• A Windows XP-compatible DVD decoder.
For more information about *.dvr-ms files, visit the following Microsoft Web site:
http://msdn.microsoft.com/library/en-us/dnwmt/html/dvrfilechanges.asp
-----------------------------------------------------------------
http://support.microsoft.com/?scid=kb;en-us;q316992