DVR-MS
From Just Solve the File Format Problem
DVR-MS (Microsoft Digital Video Recording) is a proprietary ASF-based mutimedia format. It was used by Windows XP Media Center Edition, and some later versions of Windows Media Center. It was succeeded by WTV.
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Identification
There's probably no simple way to distinguish DVR-MS from other ASF formats. It can surely be done by parsing the file, maybe by looking for an Extended Content Description descriptor named "DVR File Version".