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*Details: File format summary



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Name Microsoft Excel 2000-2003 Workbook (xls)
Version 8X
Other names Microsoft Excel Workbook (XP-2003), Microsoft Excel Workbook (2002-2003)
Identifiers MIME:  application/
Apple Uniform Type Identifier:
PUID:  fmt/62
Classification Spreadsheet
Disclosure None
Description The Binary Interchange File Format (BIFF) is a spreadsheet file format developed by Microsoft. BIFF 8X is a native file format of Microsoft Excel XP. 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. BIFF 8X 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. The format remained unchanged with the release of Excel 2003.
Orientation Binary
Byte order Little-endian (Intel)
Related file formats Has priority over OLE2 Compound Document Format  
Is subsequent version of Microsoft Excel 97 Workbook (xls) (8)
Is subtype of OLE2 Compound Document Format  
Technical Environment  
Supported until  
Format Risk  
Developed by None.
Supported by None.
Source Digital Preservation Department / The National Archives
Source date 11 Mar 2005
Source description  
Last updated 02 Aug 2005
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