WiX, how to prevent files from uninstalling though we forgot to set Permanent=“yes”

Question

We have a product installer created with Wix, containing a program package (\"V1\") and some configuration files. Now, we are going to make a major upgrade with

Answer 1

The way I am fixing this is very simple. I don't install yourapp.config files but only yourapp.config.new On the first run the application before doing anything else check for the config file. If there is none make a copy yourapp.config.new to yourapp.config

This is very simple it doesn't use any special attributes. When the application is uninstalled the config file is not uninstalled. When the application is re-installed file is disturbed. Note that when the application is repaired the config is not modified either.