wk1 to excel conversion is searched by users looking for a way to recover the data from very old Lotus 1-2-3 spreadsheet using Excel. This might not be possible directly in latest Excel by using the File ► Open function, but it should be still possible to brute-import data.
But the best way to handle and export old file types is to find some older spreadsheet editor with support for Lotus 1-2-3 files on abandonware websites and export your data to CSV format, which you can import to Excel just fine.