.WK3 File Extension
File TypeLotus 3 Worksheet
This file is saved in a binary format, which requires a specific program to read its contents.
What is a WK3 file?
Spreadsheet file created by Lotus 1-2-3, version 3; stores data in cells, which are organized into a grid of rows and columns; may be used for a variety of data-entry purposes.
NOTE: Microsoft Excel 2007 and later no longer support WK3 files.