Untested--I don't have xl2007 and xl2003 on the same pc.
I'd try reregistering xl2003.
Close excel
windows start button|Run
"C:\yourpathtoexcel2002\excel.exe" /regserver
My thought is that xl2003 will take back the .xls extension, but leave the newer
extensions alone.
You'll want to test both the new and old extensions to see if it breaks
anything.
> How do I stop 2003 spreadsheets automatically opening in Excel 2007??
>
[quoted text clipped - 7 lines]
> I have tried changing the file association using the administrators login
> however this did not work.

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Dave Peterson