The most reliable way how to work with ancient Lotus 1-2-3 spreadsheets (.wk1, .wk!, etc.) 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.
Updated: November 25, 2021
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