The most reliable way how to work with ancient Lotus 1-2-3 spreadsheets (.wk1, .wks) would be to use the original tool, perhaps in a virtual machine. If you do not have access to the original tool, you 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.
Convert Lotus 1-2-3 version 2.x spreadsheet to Lotus 1-2-3 version 1.x spreadsheet file.
We have found 3 software records in our database eligible for .wk1 to .wks file format conversion.
Microsoft Windows software - convert wk1 to wks on Windows
Old spreadsheet program from IBM
Convert from wk1 file format
|Yes, Lotus 1-2-3 supports wk1 file conversion as a source file type.||Yes||Yes||wk1 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 wks. 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.
A spreadsheet software application from Corel
Multiplatform software - convert wk1 to wks on any platform
Full-featured spreadsheet tool from LibreOffice suite