Hello and welcome to SubSim
I would suggest you get mods that are JSGME-ready as that way you don't need to fiddle with the files and the folder paths. I am not totally sure about the path you need to use for your mod but if I remember correctly it should be: C\Program Files\Ubisoft\SH3\Data\menu\Data\ofaces Make sure you either use JSGME (you need to create the folder structure if there isn't there) or make a backup first.