xl2002 (and I'd bet xl2003) like to recalculate workbooks that were created in
earlier versions--as soon as you open them.
If there are links that can't be refreshed, you'll get those errors.
You could ask the xl2k user to convert those links to values (a copy of the
workbook--not the original!).
Jim Rech posted a registry tweak:
http://groups.google.com/[email protected]
He posted the tweak for xl2k (\9.0\ in the post).
I'm not sure if it'll work in xl2003 (you'd use \11.0\)
You'll see what that means when you follow the link to Jim's post.