It is a pretty big hack. I seem to recall in 11 (at least around RTM time, maybe not now) that if explorer.exe died then all the windows lost their rounded corn

It is a pretty big hack. I seem to recall in 11 (at least around RTM time, maybe not now) that if explorer.exe died then all the windows lost their rounded corners. There was definitely a dev build where if the start menu crashed (also explorer.exe I think) the windows 10 one would reappear, although that might’ve just been because during development they shipped both start menus.