You could reregister excel.
close excel (all instances)

windows start button|Run
type:
"C:\your path to excel 2003\excel.exe" /unregserver
and hit enter.

Then in the Run dialog:
"C:\your path to excel 2003\excel.exe" /regserver

The /unregserver & /regserver stuff resets some of the windows registry to
excel's factory defaults.

And the last version of excel installed (or reregistered) will become the
default.

BIG Robert wrote:

I use both EXCEL 2003 and EXCEL 2007. How do I get EXCEL 2003 to be the
default application when I click on a file? I do not want EXCEL 2007 to open
everytime.

--

Dave Peterson