
Fallout.ini, which is read-only by default for good reasons.
INI to start with, as far as changing things is concerned.
FalloutPrefs.ini, which contains whatever settings were made in the Options Menu of the Launcher, plus whatever has been carried over from in-game saved preferences and edits to the other. On Windows Vista and Windows 7, these should be located in the following locations, assuming C: as your install drive: ini files when modifying your game, especially doing so significantly. Those of you who cannot seem to get the console to appear, pay attention: Using the console on the Steam version of the game will disable all Steam Achievements until the game is restarted, even if no commands are entered. See the Troubleshooting section on the Discussion page for further advice. Some Vista and Windows 7 users must disable/uninstall the "Infrared" device (varies from machine to machine, but has that same line in the name) to access the tilde key. In this case, type several tabs to move the cursor in before entering your commands. The left side of the console might not be visible if you're not using a widescreen display. The mouse will control a cursor, rather than move the camera and left-clicking will select visible objects, rather than shoot them.
The game will pause, making you unable to look around while using it -be sure to be looking at what you want to change, unlock, etc. The HUD will disappear and you will get a prompt ( |) in the lower left corner of the screen where codes can be input. (Example: §, ½ or | on Scandinavian (Swedish, Danish, Norwegian etc), caret ( ^) on German keyboards, ² on French ones, \ or | on Italian Keyboards, ' on Brazilian Keyboards, " on Turkish keyboards). The key is the top left key under escape, on non-US keyboards. Other keyboard layouts will differ, but the key is usually to the left of 1, and just under the Escape key ( Esc). The grave accent key shifts to tilde ( ~) on US keyboards, and the not symbol ( ¬) on UK keyboards. To access the console, use the grave accent key ( `) while in-game (Unpaused). 10 Reputations ( Fallout: New Vegas only).