{
 "id": "multimedia-viewer-book",
 "name": "Multimedia Viewer Book",
 "category": "other",
 "identifiers": {
  "extensions": [
   "mvb"
  ],
  "mime": [
   "application/octet-stream"
  ],
  "puid": [
   "fmt/1800"
  ],
  "wikidata": [
   "Q105863149"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "3f5f0300",
    "notes": "Multimedia Viewer Book"
   }
  ],
  "signatures": [
   {
    "name": "Multimedia Viewer Book",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "3f5f0300*6c031b000100"
     }
    ]
   }
  ]
 },
 "status": "unknown",
 "summary": "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.",
 "tools": [
  {
   "name": "Microsoft Multimedia Viewer",
   "url": "https://www.wikidata.org/wiki/Q112762591",
   "reads": true,
   "writes": false
  }
 ],
 "projects": [
  {
   "name": "File Formats Wiki",
   "url": "http://fileformats.archiveteam.org/wiki/Multimedia_Viewer_Book",
   "kind": "wiki"
  },
  {
   "name": "PRONOM fmt/1800",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/1800",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q105863149",
   "url": "https://www.wikidata.org/wiki/Q105863149",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "ffw",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-24",
 "aliases": [],
 "structure": [],
 "parsers": [],
 "conversions": [],
 "samples": [],
 "claims": [],
 "verification": []
}