I am fucking retarded hahahah, for some reason I placed the game.exe outside the folder prg. When I put it inside the folder the coin enabler was able to find the process and the insert coin option appeared.
We talked about it some time ago, I did what you said but did not work. I would like to see your games files, maybe my files are wrong or something.
What is your game configuration? Dongle, pcb, etc.?