Forces DirectInput 8 games to read devices in background, whether they want it or not.
The dlls are here.
For 32bit games, download dinput8hook.dll.
For 64bit games, download dinput8hook_x64.dll.
Then rename that dll into dinput8.dll and place into the same directory where the game executable is located.
Only tested with the GameMaker Studio 2.3 runner, both 32bit and 64bit.
If you have an Unreal Engine game then you might need to run the game once and use the Task Manager to find the real engine executable, since it is somewhere in the 'shipping' folder.
(that also applies to all games that use any launchers of sorts)
This may not work properly with some games if the game engine's DirectInput code is uh, weird.
GameMaker Studio's code seems to be fine, just the flags are wrong. Your game might even crash.
Build the DLL in Visual Studio 2019 with C++.
The debug configuration will auto-wait till a debugger is attached to the game engine once the dll is called.