iF THE GAME WON'T RUN, THIS WON'T FIX IT, THIS JUST MAKES A RUNNING GAME PORTABLE

Change the registry to the current LAUNCH folder then launch the game
Launch the game with this script and it will update the location of the files in the registry, the eun the application


The last part of the path should be

FallOut3Portable
FallOut3Portable - Backup Settings.ps1
FallOut3Portable - Restore Settings.ps1
FallOut3Portable.ps1
+---Fallout3
+---Data
¦ +---Music
¦ ¦ +---Base
¦ ¦ +---Battle
¦ ¦ ¦ +---Finale
¦ ¦ +---Dungeon
¦ ¦ +---Endgame
¦ ¦ +---Explore
¦ ¦ +---Public
¦ ¦ +---Special
¦ ¦ +---Tension
¦ ¦ +---TranquilityLane
¦ +---Shaders
¦ +---Video
+---Settings
+---Fallout3
+---Saves

Install the game, then copy the program files to the folder {Extenal USB Drive}\FallOut3Portable\FallOut3
The Settings folder is created with the backup and restore scripts automatically