Unwanted Prompt When Saving a Protected Sheet in 2007

F

faraway

Each time I save an existing (2003 version in Compatability Mode) Protected
workbook I am asked in a prompt if I want to upgrade the workbook to the 2007
version for extra safety. I do not want to.

I think the first time I got the prompt there was an option to "turn it
off", but I didn't take it.
How can I turn this annoying prompt off for good?
 
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