Ah sorry ;). Google, forum, or Nexus file searches will usually help you there, but: FOSE = Fallout Script Extender: http://fose.silverlock.org/ Many mods require it (they will usually say so in their docs), and there are few reasons to avoid it (disables GFWL, although many see that as a benefit) so you should just go ahead and download and install it now. The "installation" doesn't change anything and using it is just a matter of launching the game with a different shortcut (see the included readme), so you can always run the game without it at any time. FWE = FO3 Wander's Edition: http://www.fallout3nexus.com/downloads/file.php?id=2761 A popular gameplay overhaul mod for Fallout 3. EDIT: sorry again, GFWL = Games for Windows Live, Microsoft's in-game app for tracking achievements, chat, etc.