Windows Movie Maker

Unknown

video

Windows Movie Maker is video editing software by Microsoft. A .mswmm file won't typically contain any source audio or video data, rather it will contain references or pointers to the source data. For this reason extracting a .mswmm file from its context may result in the movie being unable to play. A movie exported to a video format from within the application will contain the appropriate data for portable playback.

Identify it

Extensions	`.mswmm.wlmp`
MIME types	`application/octet-stream`
Signatures	`d0cf11e0a1b11ae100` at byte 0
PRONOM	`fmt/971`
Wikidata	`Q50374860`

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Open it

Windows Movie Makerreads and writes · Microsoft end-user license agreement

Convert it

No conversion recorded. One of the tools above may export it; search for a chain.

Sources

File Formats Wiki
PRONOM fmt/971
Wikidata Q50374860

From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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