One possibility is that you have some 'volatile functions' in these
workbooks. Take a look at Charles Williams' WebPage for a listing.

http://www.decisionmodels.com/calcsecretsi.htm

HTH
Paul
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Be advised to back up your WorkBook before attempting to make changes.
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Any ideas why, when I open a sheet and don't make changes,
when I go to close the sheet, system asks me if I want to
save. This seem to only happen with some files? Is there a
setting somewhere on the file or the system setting? Any
ideas welcome?

Thanks