MCE or Media Center Edition creates video and audio recordings in DVR-MS format (extension is ".DVR-MS").
If you try changing the DVR-MS extension, it will not play. You can only play DVR-MS files on Windows Media Center Edition and Windows XP with Service Pack 2 computers.
To play DVR-MS files on a standard DVD player, you need to convert it to the MPEG 2 format. Then you can use any DVD burning software to create the DVD. Digital Media Converter supports converting DVR-MS files to many different media formats (such as WMV, AVI, MPEG 2, MOV etc.)