Microsoft Works Spreadsheet

File Format
Name	Microsoft Works Spreadsheet
Ontology	Electronic File Formats Document Spreadsheet Microsoft Works Spreadsheet ; ; ; ;
Extension(s)	.wks, .xlr, .bks
PRONOM	fmt/166, fmt/901, others

This article describes the formats used by the spreadsheet component of the Microsoft Works office suite.

See Microsoft Works for more information and resources.

Identifiers

Format	Version	Ext.	PRONOM
Microsoft Works Spreadsheet	1-5	.wks	fmt/166
Microsoft Works Spreadsheet	6-9	.xlr	fmt/901
Microsoft Works Spreadsheet for Macintosh	3	.wks	fmt/270
Microsoft Works Spreadsheet for Macintosh	4	.wks	fmt/271
Backup file		.bks

Early versions 1-5 WKS files begin with a 00 or ff byte, followed by 00 02 00 04 04 05 54 02 00.

XLR files (from Works 6.0+) are based on Microsoft Compound File.