Avoid this situation because data loss could occur if you :
Run Microsoft Excel 2007 or later without Crystal Ball 7.3.x or later loaded.
Save an XLS workbook to one of the Microsoft Excel 2007 or later file formats.
In a separate session, run Microsoft Excel 2007 or later without Crystal Ball 7.3.x or later loaded again.
Open the workbook that was created in step 2 and resave it back to the XLS format.