Security Update for Excel Viewer 2003 (KB914451) sets Viewer as default App

Hi,
I've got a problem with the Security Update for Excel Viewer 2003
(KB914451). On every machine in our environment is the Excel Viewer
installed as Default Viewer for xls-Files. On some machines Office 2003
Prof is installed too.
Now, with the installation of the Security Update for Excel Viewer 2003
(KB914451), on machines with office and the Viewer installed, the Excel
Viewer is set as the default application for xls-files instead of
Excel. So the users aren't very happy.... The rollout hasn't started
and I don't want to reset the default app for xls Files manually or
provide a script to reset it back again to excel.
So, is there a way to prevent the update from setting the vewer as the
default app for xls-Files?
Kind regards,
Jürgen