Relying on the installer's file replacement rules, do a major upgrade with 
RemoveExistingProducts right at the end of your execute sequence as 
InstallExecute, RemoveExistingProducts, InstallFinalize. The incoming Xml file 
will replace the old one only if it's not been updated (file replacement rules 
for neither file has a version creation date vs modify date) and leave behind 
the older modified one. 

Phil Wilson 


-----Original Message-----
From: Alex Ivanoff [mailto:alex.ivan...@shavlik.com] 
Sent: Friday, May 22, 2009 9:39 AM
To: General discussion for Windows Installer XML toolset.
Subject: [WiX-users] Preserve xml config settings on major upgrade

What is the best way to preserve xml config settings on major upgrade?

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