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<PRONOM-Report xmlns="http://pronom.nationalarchives.gov.uk">
  <report_format_detail>
    <FileFormat>
      <FormatID>2651</FormatID>
      <FormatName>Multimedia Viewer Book</FormatName>
      <FormatVersion>
      </FormatVersion>
      <FormatAliases>
      </FormatAliases>
      <FormatFamilies>
      </FormatFamilies>
      <FormatTypes>Aggregate</FormatTypes>
      <FormatDisclosure>
      </FormatDisclosure>
      <FormatDescription>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.</FormatDescription>
      <BinaryFileFormat>
      </BinaryFileFormat>
      <ByteOrders>
      </ByteOrders>
      <ReleaseDate>
      </ReleaseDate>
      <WithdrawnDate>
      </WithdrawnDate>
      <ProvenanceSourceID>244</ProvenanceSourceID>
      <ProvenanceName>Preservica / Preservica</ProvenanceName>
      <ProvenanceSourceDate>23 Nov 2022</ProvenanceSourceDate>
      <ProvenanceDescription>
      </ProvenanceDescription>
      <LastUpdatedDate>23 Nov 2022</LastUpdatedDate>
      <FormatNote>
      </FormatNote>
      <FormatRisk>
      </FormatRisk>
      <TechnicalEnvironment>
      </TechnicalEnvironment>
      <FileFormatIdentifier>
        <Identifier>fmt/1800</Identifier>
        <IdentifierType>PUID</IdentifierType>
      </FileFormatIdentifier>
      <Developers>
        <DeveloperID>93</DeveloperID>
        <DeveloperName>
        </DeveloperName>
        <OrganisationName>Microsoft Corporation</OrganisationName>
        <DeveloperCompoundName>Microsoft Corporation</DeveloperCompoundName>
      </Developers>
      <ExternalSignature>
        <ExternalSignatureID>3245</ExternalSignatureID>
        <Signature>mvb</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <InternalSignature>
        <SignatureID>2139</SignatureID>
        <SignatureName>Multimedia Viewer Book</SignatureName>
        <SignatureNote>BOF offset 0, 4 byte magic 0x3F5F0300, later SYSTEMHEADER 0x6C03, Format version WMVC/MMVC media view file: 0x1B00, Major version: 0x0100. Reference: http://delphi-kb.blogspot.com/2010/07/detailed-description-of-winhelp-file.html</SignatureNote>
        <ByteSequence>
          <ByteSequenceID>2481</ByteSequenceID>
          <PositionType>Absolute from BOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>0</MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>3F5F0300*6C031B000100</ByteSequenceValue>
        </ByteSequence>
      </InternalSignature>
    </FileFormat>
    <SearchCriteria>Criteria</SearchCriteria>
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</PRONOM-Report>
