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*Details: File format summary



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Name Microsoft Excel 5.0/95 Workbook (xls)
Version 5/95
Other names Microsoft Excel Workbook (5.0)
Identifiers MIME:  application/
Apple Uniform Type Identifier:
PUID:  fmt/59
Classification Spreadsheet
Disclosure None
Description The Binary Interchange File Format (BIFF) is a spreadsheet file format developed by Microsoft. BIFF 5 is a native file format of Microsoft Excel 5.0 for Windows. The format is proprietary and Microsoft does not make details of its structure public. The information here is derived primarily from's reverse-engineered documentation of the format and should not therefore be regarded as definitive. From Excel 5.0 onwards, BIFF is based on Microsoft’s generic OLE2 Compound Document Format. An Excel workbook is stored as a ‘Book’ stream within a Compound Document Format file. The Book stream comprises a Workbook Globals Substream, containing a Beginning of File (BOF) record, the Workbook global records, and terminated by an End of File (EOF) record. This is followed by one or more Worksheet substreams, containing a Beginning of File (BOF) record, the worksheet records, and terminated by an End of File (EOF) record.
Orientation Binary
Byte order Little-endian (Intel)
Related file formats Has lower priority than Microsoft Excel 97 Workbook (xls) (8)
Has priority over OLE2 Compound Document Format  
Is subsequent version of Microsoft Excel 4.0 Worksheet (xls) (4S)
Is subsequent version of Microsoft Excel 4.0 Workbook (xls) (4W)
Is subtype of OLE2 Compound Document Format  
Technical Environment  
Supported until  
Format Risk  
Developed by Microsoft Corporation
Supported by Microsoft Corporation
Source Digital Preservation Department / The National Archives
Source date 11 Mar 2005
Source description This format can be identified via a container signature in DROID version 6 or later. The PRONOM database cannot currently represent container signatures.
Last updated 18 Dec 2012
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