The most reliable way how to work with ancient Lotus 1-2-3 spreadsheets (.wk1, .wk4 etc.) would be to use the original tool, perhaps in a virtual machine. If you do not have access to the original tool, you will have to use some 3rd party software for the job, for example some open source productivity suites that may still support old Lotus 1-2-3 formats.
Home > Search converters: wk1 to wk4
Conversion of wk1 file format to wk4 file format beta
Search for wk1 to wk4 converter or software able to handle these file types.
Convert Lotus 1-2-3 version 2.x spreadsheet to Lotus 1-2-3 version 4.x spreadsheet.
We have found 4 software records in our database eligible for .wk1 to .wk4 file format conversion.
Microsoft Windows software 
- convert wk1 to wk4 on Windows
Lotus 1-2-3
Old spreadsheet program from IBM
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from wk1 file | Yes, Lotus 1-2-3 supports wk1 file conversion as a source file type. | Yes | Yes | wk1 editor | Yes | No | No | No |
to wk4 file | Yes, Lotus 1-2-3 supports wk4 file conversion as a target file type. | Yes | Yes | wk4 editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned wk1 to wk4. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Corel Quattro Pro
A spreadsheet software application from Corel
Microsoft Excel
A popular spreadsheet application distributed with Microsoft Office suite
Multiplatform software 
- convert wk1 to wk4 on any platform
LibreOffice Calc
Full-featured spreadsheet tool from LibreOffice suite
Additional links: Open wk1 file, Open wk4 file
WK1
Files with wk1 extension are spreadsheets saved in old Lotus 1-2-3 office program. These files were used in version 2.X.
WK4
Files with wk4 extension are spreadsheets from very old version of Lotus 1-2-3 spreadsheet editing software.
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