.... the exe that I see is :
Diablo III64.exe and Diablo III.exe
The application silently runs in the background and waits for the combination of keys to be held down and will kill said application above. It will NOT kill the D3 Launcher.
here is an example of Blizzards failure to address the issue:
https://us.battle.net/forums/en/d3/topic/20759210139?page=5#post-100