The file is almost always located in your user profile, separate from the main installation folder:
If your file is missing or corrupted, use these official methods to get a fresh copy: skachat fail falloutprefs ini
You typically do need to manually download this file from the internet; instead, you should let the game regenerate it automatically to ensure it matches your specific hardware. How to "Download" or Restore the File The file is almost always located in your
The FalloutPrefs.ini file is a critical configuration file used by Fallout games (such as Fallout 3, New Vegas, and Fallout 4) to store your specific graphical, audio, and gameplay settings. and gameplay settings.