You're looking in the wrong place, all this stuff is in the GAMEDATA.GTC file. , make whatever changes you want in the extracted files, then re-build it into a new GTC.
I can't find it, all I see is Saved Games.
In GAMEDATE.GTC, it has nothing but blobs.
Uh, what exactly do you mean? Did you open it in a program such as Notepad?
You need to download the linked tool thatposted, and use that on the GTC file. If you need more help I could write a tutorial