Home : File Types : WK1 File

.WK1 File Extension

FREE DOWNLOAD Open over 300 file formats with File Viewer Plus.

File TypeLotus Worksheet

2.1 (7 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
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.

Programs that open WK1 files
IBM Collaboration Solutions
Corel Quattro Pro X7
Apache OpenOffice
IBM Collaboration Solutions
Planamesa NeoOffice
Apache OpenOffice
Apache OpenOffice
Updated 4/8/2014

FileInfo - The File Extensions Database

This page contains information about the .WK1 extension and its known file associations. Our goal is to help you understand what a WK1 file is and how to open it.

The Lotus Worksheet file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and therefore do not publish any information we have not verified.

If you would like to suggest any additions or updates to this page, please let us know!