EASY FIX for not starting after resolution change!
If you are like me and increased the resolution on the game only to find out it would no longer launch, here is the fast and easy fix I discovered!
Just delete the "wolfconfig.cfg" file and re-start the game. Here is how....
1. Go to your STEAM folder, --> Steam Apps, --> Common, then --> Return to Castle Wolfenstein -> go into the folder called MAIN and find the config file named "wolfconfig.cfg" then just DELETE THIS FILE! Re-start the game and it will work!