As has already been said, Normal.dotm is not an Excel file - it's a Word file.
Having a copy of Normal.dotm on Dropbox is of no consequence in and of itself. What might matter is whether Excel has been configured to use as its XLSTART folder the same folder that Word has been configured to store its Normal template in.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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