We have found 6 software records in our database eligible for .wk1 to .xls file format conversion.
Some modern spreadsheet programs are still able to open the old Lotus spreadsheets (.wk1). You will most likely lose all of the original formatting, but there should be no problem to save the data from tables, in some of the common formats, for example XLS from MS Excel.
You can also find some utilities, such as the ABC Amber Lotus Converter, that were specially designed for the purposes of conversion of old Lotus documents and spreadsheets.
WK1
Files with wk1 extension are spreadsheets saved in old Lotus 1-2-3 office program. These files were used in version 2.X.
XLS
Files with xls extension are best known as spreadsheets from Microsoft Excel. A spreadsheet is basically a grid of cells sorted in rows and columns. Each cell can contain text, numeric or formula data. Excel XLS spreadsheets can be opened in most other similar programs, such as OpenOffice.org Calc.