Windows: Cleanup how "exec" works.
Windows: Cleanup how "exec" works.

* The documentation asks to not use "subprocess.call" because it
  may dead lock, so lets not do it, and use a process with
  proper "communicate" and "wait" method calls instead.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka