It’s not. It’s a Microsoft signed executable that gets dumped in the temp directory and run. I was pretty angry when it popped up (not least because Windows had just bluescreened while trying to resume from hibernation - hibernation because modern sleep is shit). Rather then hunt down exactly how Microsoft got it onto “my” system, I just killed it and got on with my day.
It’s a work laptop but I’m sorely tempted to drop NixOS on it anyway.