Two possibilities (there may be others)
1. If there is a macro which runs when the file is opened, this effectively
changes the file, even if all the data remains the same.
2. If the file was created with an older version of Excel, you will be
prompted to save the file. I think in this case the message box tells you
why.

--
Ian
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"Sam" wrote in message
...
Why does excel ask if i want to save a document when i have made no
changes?
it happens only with certain workbooks, not all of them. Do I need to
change
my settings?