Start up AHIII (or any Direct3D coded game) to the 1st screen (this initially executes the game's .exe) then open up Win 10 Game Mode (after enabling it in Windows 1st, should be the Win 10 Game Bar that is opened up...this control bar can also be opened up while in game operation as well), go to Settings. Once in there you should find a checkbox w\ the words "Remember this .exe as a game" beside it, put check in the box then exit out & close Game Mode. Or while in there you can enable other settings to instruct Game Mode to stream, use the microphone, etc while Game Mode is active within the selected game while it is running if desired (do this only if you're also gonna be using any of the embedded Win 10 control apps like Xbox Broadcast for streaming while in game, Xbox Game DVR for recording while in game, etc). Then proceed to the game & run as usual as Game Mode is now active within the game.
Going forward when you start AHIII Win 10 will automatically start Game Mode (if Game Mode is enabled in Win 10) & will apply any extra CPU/mem resources deemed needed according to how the game is operating on the current Direct3D GPU hardware installed & any other settings you select in Game Mode to use while running the game. As long as the checkbox is selected this process is now fully automated. To disable Game Mode for any reason from AHIII (or any Direct3D game associated to it) just go back into Settings on the Game Bar & uncheck the checkbox.
This is the manual procedure to set up Win 10's Game Mode to run w\ any DirectX game that isn't using Win 10's Win Store coding (which will auto recognize a game to Game Mode) as other apps than just games use the DirectX API's.
Hope this helps.
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