Home : File Types : WK1 File

.WK1 File Extension

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File TypeLotus Worksheet

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CategoryData Files


This file is saved in a binary format, which requires a specific program to read its contents.


Spreadsheet created by Lotus 1-2-3, a popular spreadsheet program in the 1990s; contains cells, which are organized by rows and columns; used to store and analyze structured data, as well as quickly compute formulas.

More Information

Lotus 1-2-3 is included with Lotus SmartSuite, which was acquired by IBM in 1995.

NOTE: WK1 files can be opened in some versions of Microsoft Excel. However, some formatting information may be lost during conversion. WK1 files are no longer supported by Excel 2007 and later.

Program(s) that open .WK1 files
Microsoft Windows LogoWindows
IBM Collaboration Solutions
Corel Quattro Pro X7
Apache OpenOffice
Mac OS X LogoMac
IBM Collaboration Solutions
Planamesa NeoOffice
Apache OpenOffice
Linux LogoLinux
Apache OpenOffice
Updated 4/8/2014