I believe Excel 2003 will allow you to save and Excel file to a Lotus WK.4. That feature went away with Excel 2007. I am using Excel 2010 and that feature is not in it. You may be able to bridge over using Open Office Spreadsheet. I don't have it on this computer. If you have Open Office, open your Excel SS in it and try to save as a Lotus file. Maybe some one else knows for certain.