Thanks for your reply. I have the original CD, installed it and it worked. After that I just did what you discribed. I know you cannot copy a running program from one PC to another.
I copied the circuits (S1CTxx) and tracks (xyz2001.wad). Tested it, found only my Hockenheim track ctd, which is strange considering these files are the same as mine. But that is not that important, yet. Other tracks worked ok, as far as I've checked.
So I decided to copy the 2009 cars. These have the two shapes. One is YohanFGP'shape for McLaren (by KTC), Brawn (by Exqo), Ferrari (by KTC), RBR (by Lee71), STR (not known), Force (Alexschumi), Toyota (by KTC), Williams (by Isaint) and my personal car (by myself); the other shape (by Vass) is Renault (by DaMon) and BMW (by Mapaq).
I extracted the original cars.wad and imported the copied cars, helmets etc. from my own PC's cars.wad and created a new cars.wad from that.
So there is no difference in the files, because it should not differ if I downloaded them from this great site or copied them from one PC to another.
What is so strange, the Brawn is good but the McLaren graphics were messed up. My personal car, Toyota and Force were also great, the Williams, RBR and STR are not. Both Renault and BMW also had messed up graphics. The shapes are good, I checked that while playing with game resoltions and texture detail in game. I did this in order to find the reason/solution. I think I tried every setting from low to high textures in the graphics menu to the resolutions 800x600 and 1024x768.
Now I'm back to the standard cars.wad again, and the org cars works. Next I try to find an encrypted GP.exe Patch 9.6, but using that is coping the exe over the org gp4.exe. So instead I used mine, well working, GP4.exe. I know about coping and registry problems. I'm IT consultant, so I'm aware of issues concerning registry. But still, copy the encrypted 9.6 pathed GP4.exe over the org GP4.exe should give problems, which do not accure (or not that I'm aware of). And the whole community did just that?
It has to be something else, and I'm done thinking it over and over, and trying very carefully little steps. Something is wrong, but the discription above (some cars textures work, and other do not) is strange. I'd rather had that all cars textures were messed up, that would have been easier I guess. It is not the painters problems, but my own. I also deleted the gp4state file to see if there was something left behind, but that didn't help either.
But I seem to miss something or fail to see a little detail. I have had some problems before but found the solution on the forum here. This is a really great place with a lot of knowledge and very helpfull people. I really like that.
Please try to reconstruct in your mind what I'm doing and what I might have missed. Anything, that you consider not important, can be the solution.
For now a good night, because I have to make a living and that doesn't come from GP4 for sure!