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What is CDF-MS? CDF-MS is used as the file extension for WinSxS FileMaps files. .CDF-MS files are binary files that are used to WinSxS FileMaps files to support Volume Snapshot Service. See the sample .CDF-MS file included below.

File Extension: .CDF-MS

MIME Type: application/octet-stream

File Content: WinSxS FileMaps

.CDF-MS files are WinSxS FileMaps files saved as binary files to support Volume Snapshot Service. Here are the first 64 bytes of a sample .CDF-MS file, program_files_common_files_microsoft_shared_dao_3c86dc390b3b2f48.cdf-ms, dumped in HEX values:

50 63 6d 48 01 00 00 00 00 00 00 00 0f 86 90 51 PcmH...........Q
99 ea 06 8a 11 00 00 00 88 00 00 00 0c 00 00 00 ................
54 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 T...............
84 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00 ................

.CDF-MS WinSxS FileMaps file sample: Click sample.cdf-ms to download.

For more information on .CDF-MS WinSxS FileMaps files, see links below:

• How Volume Shadow Copy Service Works