What is WK4? What Opens a WK4? File Format List from WhatIs.com

File Extension

WK4 File Format

Spreadsheet (Lotus 1-2-3 v. 4)

The WK4 file extension is primarily associated with a spreadsheet file for Lotus 1-2-3 v. 4. Lotus 1-2-3 was the second spreadsheet application, developed after VisiCalc and before Microsoft Excel. It was the first to introduce cell names and macros. IBM bought Lotus in 1995.


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See questions and answers about working with spreadsheets.

This was last updated in September 2010
Editorial Director Margaret Rouse

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