@B-DizL, it appears that he's using mod manager, rather than the launcher.
@Spitfire, there are several types of .pack files in NTW. In TGW, most of the files are "mod" type, but some - including the text file - are "movie" type. This isn't our choice, unfortunately certain modifications require certain pack types.
Mod manager only disables "mod" type packs. So if you want to make sure TGW is fully de-activated, you need to move the files to a different folder.
It might also be possible to rename the TGW "movie" type packs so that they are alphabetically superior or inferior (I don't remember which) to the NTW3 "movie" type packs.
PS. Biggest possible problem?