How to Resolve - 2007 wants to save my *.xlsx when I haven't made any changes?

2007 wants to save my *.xlsx when I haven't made any changes

I have a bunch of old MS Excel files.
Some Excel 2003 *.xls.
Others Excel 2007 *.xlsx.
Some I created a while ago.
Others I inherited from someone else.
 
With some, if I open them, make NO changes, then close them, they close just fine and I'm done.
 
Yet, with others, if I open them, make NO changes, then close them, Excel asks me:
 
     "Do you want to save the changes you made to 'my_excel_file.xlsx'?"
 
What's up with that? Why does Excel ask me to save changes that I never made? Is there an option I can check on/off to enable/disable this behavior?

Anwsers to the Problem 2007 wants to save my *.xlsx when I haven't made any changes

Download Error Fixer (Free)

Hi,
 
One likely cause is that you have volatile formula in the workbook that are changing when you open it.
The most obvious example of which is =NOW() which inserts the current date/time but there are other less obvious ones.
have a look here.
 
 
http://www.decisionmodels.com/calcsecretsi.htm
 
No there isn't an option to shut this off.

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