DVR-MS (Microsoft Digital Video Recording) is a proprietary video and audio file container format, developed by Microsoft.
This format used for storing TV content recorded by Windows XP Media Center Edition, Windows Vista and Windows 7. Multiple data streams (audio and video) are wrapped in an ASF container with the extension DVR-MS. Video is encoded using the MPEG-2 standard and audio using MPEG-1 Layer II or Dolby Digital AC-3 (ATSC A/52). The format extends these standards by including metadata about the content and DRM, digital rights management.
Generally speaking any Windows machine can read this format with its media player.