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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