HOI Darkest Hour

[Lowlander]

Bought this sale item for the WW1 mod, it's a GEM, and upgraded to latest beta patch, it cost less than 2 quid.
It works well on Windows 10, however I cannot exit the game, no button is visible and I have not discovered a shortcut key, have to resort to using task manager to shut it down.
Any guidance would be greatly appreciated.

Wait, I found on the web that Alt and Tab keys held down together minimize the game window, then left-click X to exit and close game.