Hi man and welcome to SS!
I think this post sort of explains it.
http://www.subsim.com/radioroom/show...3&postcount=18
I think your prob is that YOU MUST DELETE THE BACKUP FILE before you load the game. So if you change let say scene.dat
After you did all your tweaks, go to the folder that contains the file you tweaked, in this case
C:\Program Files\Ubisoft\Silent Hunter 4 Wolves of the Pacific\Data\scene.dat
and look for a
"Copy of scene.dat"
This is the UNTWEAKED DATA! and is created automatically when you do a tweak using the Minitweaker in case you want to revert back. The game LOADS THIS instead of the TWEAKED file for some reason... so in order to see the changes, move that at ANOTHER LOCATION! or delete it!
The tweaked file has the original name, in this case "SCENE.DAT" so leave that where it is and load the game and you will see the changes i am sure.