Hey poisonheadcrab,
The wrong game dll API version error is cause by conflict between the gamex86.dll and doom3.exe versions.
I was getting this error for months and couldn't run mods or run doom.
It happens when you install a mod that is not compatible with the doom version you have installed. For example, I installed doom3 v1.3 and then installed a mappack/no-cd mod , when I tried to patch to doom3 1.3.1 for vista I got that error when launching the game.
I only overcame this error yesterday. I had to uninstall doom3, make sure to maually delete the doom3 folder from program files (as for some reason the uninstaller doesn't do this and leads to problems), you can copy your savesgames folder first and replace it in the program files\doom3\base folder after you reinstall. Then reinstall and straight away patch the game to 1.3.1, or don't if you want to ru mods that are only supported by v1.3. You must check whether a mod is supported by the version you are running before you install it or you will run into this prblem again. Any time you remove doom3 you must delete the doom3 folder from program files.
eoinmfoley
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