A wk4 file extension is related to the Lotus 1-2-3 spreadsheet editing software, developed by IBM. A wk4 file stores spreadsheet document.

Detailed description

Software that open wk4 file

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WK4 file extension - Lotus 1-2-3 version 4.x spreadsheet

What is wk4 file? How to open wk4 files?

File type specification:

Spreadsheet and workbook file type icon Spreadsheet and workbook file type

wk4 file icon: wk4 filetype icon

The wk4 file extension is associated with Lotus 1-2-3 version 4.x and used for spreadsheet documents. Lotus 1-2-3 is a discontinued product.

The wk4 files were used as the default spreadsheet format of  Lotus 1-2-3 version 4.x.

MIME types:

This wk4 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: June 20, 2022

The default software associated to open wk4 file:

Lotus 1-2-3 icon

IBM logoLotus 1-2-3  Microsoft Windows software

Company or developer:

IBM Lotus 1-2-3 is spreadsheet application very popular in 80s and 90s of 20th century. It was released for Microsoft Windows, MS-DOS, Mac OS and OS/2. In 2002 IBM stopped the developing of the IBM Lotus 1-2-3. In the latest versions is Lotus 1-2-3 fully compatible with Microsoft Excel.

Help how to open:

Use Lotus 1-2-3 version 4.x or later to open the *.wk3 files.

Also some modern spreadsheets programs can still open the *.wk4 files. However the latest versions of Microsoft Excel from 2007 no longer support that format. You can have luck with any earlier version of Excel, but you will probably lose most of the formatting from the .wk4 files.

How to convert:

You can open *.wk4 in Microsoft Excel and save it to another file format. You will probably lose formatting.

Find conversions from wk4 file:

wk4 to csv

wk4 to ods

wk4 to pdf

wk4 to txt

wk4 to xls

wk4 to xlsx

wk4 to xml

Find converter to wk4 file type:

123 to wk4

wk1 to wk4

xls to wk4

xlsx to wk4

List of software applications associated to the .wk4 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open wk4 file, edit wk4 file, convert wk4 file, view wk4 file, play wk4 file etc. (if exist software for corresponding action in File-Extensions.org's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting wk4 files.

Software that open wk4 file - Lotus 1-2-3 version 4.x spreadsheet

Programs supporting the exension wk4 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open wk4 file action.

Microsoft Windows:

Main software associated with wk4 file by default:
Lotus 1-2-3 small icon Lotus 1-2-3
Other suggested software:
Corel Quattro Pro small icon Corel Quattro Pro
Microsoft Excel small icon Microsoft Excel


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