I've run into this limitation on a large weekly report that I do. The unfortunate thing is that I've completed this week's report (after 12 hours of work) and now can't open the file. I'm using Excel 2000. Every time I try to open the file, I get this error. I've tried moving it into a ZIP file, setting it to 'read only', copying to a new file, and doing a 'view only'. Nothing works, I am not able to open the file. Any ideas how I can recover my work?