[Bug 45974] regedit exits prematurely

https://bugs.winehq.org/show_bug.cgi?id=45974

--- Comment #2 from Sergey Alirzaev  ---
(In reply to Alexandre Julliard from comment #1)
> There's a 1-second delay before shutting down an existing explorer process,
> to improve performance in case another app is launched right away. That's on
> purpose.

`sleep 5` is because lesser values have misfired at least once. What would be
the proper way to wait for it to die or kill it for good?