Prompt user to close application during uninstall (in WiX)

Question

I am using Windows Installer XML 3.0 (WIX3) to install some software.

Everything works fine, however, I\'m having a really hard time to handle the following use case

Answer 1

Can you check the uninstall logs (here is how to enable them), as far as I remember Windows Installer will put your files in a delete pending state and ask for a reboot at the end.
Also you can write a simple custom action that will kill your process.