MSI Major Upgrade overwriting rules

Question

I think I read it somewhere, but couldn\'t find the source now and can\'t confirm it: when install(Major upgrade) a newer version from MSI, if the file has been modified (ei

Answer 1

Behaviour what you are saying is unversioned file replacement logic.
Placing config file in its own component and marking the config file as the key path of the component will ensure that Windows Installer will use unversioned file replacement logic when deciding whether or not to replace this file in the install of your new version.

This post can help you to achieve the same.