Firstly, Windows 10 won't at all be the problem as to why you don't have the markings.cfg . I have Windows 10 and it had the .cfg file first time, I didn't have any problems whatsoever. However the Notepad file that is shown is the .cfg file my dear, but make sure it's in the main FeralHeart folder, basically where the original markings.cfg file was. I'll provide you a screenshot if what you've read doesn't make any sense.