hi
windows considers the last version installed as the default so it's basicly
a windows thing, not necessarily an excel thing.
one possible fix would be to reinstall excel 03 to re-set it as default.
another would be to do a detect and repair in 03 setup. some have reported
success with this.

good luck.
regards
FSt1

"Michelle" wrote:

ever since I've installed 2007, all my files will start up 2007 when I
double -click them.

Can I set up my machine so that:

xlsx will open up 2007

and

xls will open up 2003

Thanks

M