> There are already many services and APIs for doing this

I... don't think so? The particular problem here, is that an uninstaller executable needs to delete itself from disk after doing its main job.

Other than using MoveFileEx with a NULL destination file and the MOVEFILE_DELAY_UNTIL_REBOOT flag, then suggesting/forcing a reboot, I can't think of a straightforward solution.

And that solution instantly lights up your JIRA with 2 tickets:

#1: We MUST not suggest/force a reboot! Users hate it!

#2: CRITICAL BUG: uninstaller.exe still present after uninstalling product

So, then you try things like 'create a Task Scheduler job to delete the file', which then adds:

#3: PRIO 1: uninstaller.exe crashes if Windows Task Scheduler disabled

#4: SHOWSTOPPER: uninstaller.exe still not always deleted after uninstall. Why is this so hard?

Et cetera, ad absurdum. This then escalates to code injection (as described in the linked article), and (you heard it here first) kernel-mode drivers. So, if you're aware of a reliable solution, feel free to share in a comment here, for the betterment of the world!