Meanwhile I almost solved my problem. It was quite hard, but definitely I figured it out cuz all .UPCs were clearly ok...
So, there're two border-date for the game: 01/01/1938 and 31/12/1945. And they're both hard-coded into SimData.dll.
Maybe I'll write down a patching-program someday, for everybody interested to get the game working outside that time range.
Bye.
