Wix major upgrade

Question

How do I use WIX to prevent overwriting a config file during a \'Major Upgrade\'?

I want the file to be installed on the initial install, removed on uninstall, and left

Answer 1

Do you ever want it overwritten? If not in cases like this I assign the config files to their own components and mark them as Never Overwrite. This way upgrades will not overwrite the file but uninstalls will remove it.

e.g.