You will have to change the registered version back to 2007

This fix below usually works to disable Excel 11(2003)

Since 2003 has decided it wants to be the default, de-register 2003 and
re-register 2007

Close Excel first and On the Windows Taskbar

StartRun "C:\yourpathto2003\excel.exe" /unregserver

See the space between exe and /unregserver.

Then register 2007

StartRun "C:\yourpathto2007\excel.exe" /regserver

This process should make Excel 2007 the default for opening files.


Gord Dibben MS Excel MVP

On Mon, 27 Oct 2008 17:24:01 -0700, Bentam3
wrote:

I have both Excel 07 and Excel 03 successfully running on my laptop. However
when I open from excel files from windows explorer, the system chooses which
version of Excel it will open them in. Every couple of months it tends to
change which version it will use as the default. How can I force the system
to default to one or the other?