{
  "fileFormatID": 681,
  "formatName": "Microsoft Excel 4.0 Workbook (xls)",
  "version": "4W",
  "formatDescription": "The Binary Interchange File Format (BIFF) is a spreadsheet file format developed by Microsoft. BIFF 4W is a native file format of Microsoft Excel 4.0 for Windows. Excel 4.0 allowed either a single worksheet to be stored as a worksheet file (BIFF 4S), or for multiple worksheets to be combined in a single workbook file (BIFF 4W). The format is proprietary and Microsoft does not make details of its structure public. The information contained here is derived primarily from OpenOffice.org's reverse-engineered documentation of the format, and should not therefore be regarded as definitive. BIFF is a stream based format, and a BIFF 4W file comprises a Workbook Globals Substream, containing a Beginning of File (BOF) record, one or more embedded Worksheet streams (in BIFF 4S format), and terminated by an End of File (EOF) record.",
  "releaseDate": null,
  "binaryFileFormat": "Binary",
  "formatNote": null,
  "lastUpdatedDate": "19 Jul 2013",
  "formatProvenance": null,
  "formatSourceDate": "11 Mar 2005",
  "formatDisclosure": "None",
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": "Microsoft Excel Workbook (4.0)",
  "formatTypes": "Spreadsheet",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "application/vnd.ms-excel",
      "identifierType": "MIME"
    },
    {
      "identifierText": "com.microsoft.excel.xls",
      "identifierType": "Apple Uniform Type Identifier"
    },
    {
      "identifierText": "fmt/58",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 75,
      "name": "BIFF 4 Workbook/Workspace",
      "note": "BIFF4: BOF hex 0904. record length hex 0600, BIFF version=(0000|0004), filetype=workbook=0001",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": null,
          "byteSequence": "09040600(0000|0004)0001",
          "endianness": "Little-endian",
          "byteSequenceID": 192
        }
      ],
      "provenance": "www.openoffice.org/sc/excelfileformat.pdf\nwww.idea2ic.com/File_Formats/MICROSOFT%20EXCEL%20FILE%20FORMATxls.pdf\nwww.opennet.ru/docs/formats/xls.txt"
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "xlw",
      "signatureType": "File extension"
    }
  ],
  "relationships": [
    {
      "relationshipType": "Is previous version of",
      "relatedFormatID": 682,
      "relatedFormatName": "Microsoft Excel 5.0/95 Workbook (xls)",
      "relatedFormatPUID": "fmt/59"
    },
    {
      "relationshipType": "Is subsequent version of",
      "relatedFormatID": 679,
      "relatedFormatName": "Microsoft Excel 3.0 Worksheet (xls)",
      "relatedFormatPUID": "fmt/56"
    }
  ],
  "supportedBy": [
    93
  ],
  "developedBy": [
    93
  ],
  "submittedBy": [
    1
  ]
}