While attempting to open some Excel files on your computer, you must have seen the Compatibility Mode message being displayed in the title bar of the file. It’s often mistaken as a warning ...

Prior to Works 6.0, Works saved spreadsheets as WKS files, which Excel can't open. To change one of these files, open it in Works. Click "File" and "Save as," and choose "Excel 4.0/5.0 (XLS)" as ...