What is "dvr-ms"

DVR-MS (Microsoft Digital Video Recording) is a proprietary video and audio file container format, developed by Microsoft 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 Audio Layer II or Dolby Digital AC-3 (ATSC A/52). The format extends these standards by including metadata about the content and digital rights management. Files in this format are generated from the Stream Buffer Engine (SBE.dll), a DirectShow component introduced in Windows XP Service Pack 1.