Heres the link to the decrypted thing:
[
www.grand-prix.4players.de]
just put that in the gp3 2k folder and start up gpxpatch and it should work
HOWEVER
It crashed (even before the loading screen) for me. What i did was start gpxpatch in Windows 98 compatibility mode. (right click on the gpxpatch.exe, click on the compatibility tab).
Also if this all fails, make sure gpxpatch is running in Debug mode (on the first screen of gpxpatch when you load it up there is the option to run it in debug mode).
Try all this, if it fails, report back!