In order to make your copy of Fallout 4 mod-friendly, you need to edit two configuration files, Fallout4.ini and Fallout4Prefs.ini. In the case of Fallout 4, these are found (by default) in:Ĭ: > Program Files (x86) > Steam > SteamApps > Common > Fallout 4Ĭ: > Users > My Documents > My Games > Fallout 4Ĭopying these files will ensure that, in the event of a catastrophic failure on your part (or if you just want to start from a clean install), you don't have to download and re-install the game. The first step to modding any game is to make a backup of all of your games files, including any loose configuration files.