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Name Microsoft Works Spreadsheet
Version 1-5
Other names  
Identifiers PUID:  fmt/166
Classification Spreadsheet
Description Microsoft Works is a discontinued office software suite developed by Microsoft and available from 1987-2009. It was often available bundled with Windows computers. This format was a forerunner to other spreadsheet editors with grid of cells arranged in rows and numbers. Versions 1-5 were binary files before the .xlr compound files were developed from version 6 onwards.
Orientation Text
Byte order  
Related file formats Has priority over Lotus 1-2-3 Worksheet (1.0)
Technical Environment  
Supported until  
Format Risk  
Developed by Microsoft Corporation
Supported by None.
Source Digital Preservation Department / The National Archives
Source date 28 Sep 2009
Source description 11/2023 (v.115)- Description updated. Modified the offset values in the internal signature from null to 0 as part of a project to match PRONOM data with the xsd standard. Internally researched.
Last updated 14 Nov 2023
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