Multimedia Viewer Book

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other

Multimedia Viewer Book is a format developed by Microsoft and used by programs such as Encarta to provide interactive, browsable multimedia. The format is very similar to the Microsoft Help .hlp format fmt/474, and a decompiler for the file format, helpdeco is available under a GNU license: https://github.com/pmachapman/helpdeco. The .hlp format this is based on was deprecated with Windows Vista.

Identify it

Extensions	`.mvb`
MIME types	`application/octet-stream`
Signatures	`3f5f0300` at byte 0 (Multimedia Viewer Book)
PRONOM	`fmt/1800`
Wikidata	`Q105863149`

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Open it

Microsoft Multimedia Viewerreads

Convert it

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Sources

File Formats Wiki
PRONOM fmt/1800
Wikidata Q105863149

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

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