.WK1 File Extension

There is only one file type that uses the .WK1 extension:

Lotus Worksheet

Lotus Worksheet

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.

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.

Software's name License Platforms
Corel Quattro Pro Corel Quattro Pro Commercial Windows
Gnumeric Gnumeric Open Source AndroidLinuxMacWindows
IBM Lotus 1-2-3 IBM Lotus 1-2-3 MacWindows
OpenOffice Calc OpenOffice Calc Free LinuxMacWindows
Planamesa NeoOffice Planamesa NeoOffice Commercial Mac

Updated: September 17, 2014

Search File Extensions