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Summary
Name	Microsoft Excel 2.x Worksheet (xls)
Version	2
Other names	Microsoft Excel Worksheet (2.1)
Identifiers	MIME: application/vnd.ms-excel Apple Uniform Type Identifier: com.microsoft.excel.xls PUID: fmt/55
Family
Classification	Spreadsheet
Disclosure	None
Description	The Binary Interchange File Format (BIFF) is a spreadsheet file format developed by Microsoft. BIFF 2 is the native file format of Microsoft Excel 2.1 for Windows. 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 2 file comprises a single worksheet stream, containing a Beginning of File (BOF) record, followed by a series of Worksheet records, and terminated by an End of File (EOF) record.
Orientation	Binary
Byte order	Little-endian (Intel)
Related file formats	Is previous version of Microsoft Excel 3.0 Worksheet (xls) (3) Is supertype of Microsoft Excel Chart (2.x) Is supertype of Microsoft Excel Macro (2.x)
Technical Environment
Released
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
Last updated	19 Jul 2013
Note