Are you using the Steam Emulator instead of the game exe? If answer if not, do that; still not working? copy greenworks from another CoG that works into the game directory, rewriting the one here; not working even after that? Then I am out of ideas, sorry.
There is no LAUNCHER.exe or LAUNCHER_x64.exe in the files. So this game is not emulated with the usual doublydoo. But clicking ChoiceOfTheViking.exe works fine I just checked.