I downloaded a sound mod for the Z4 GT3 and dropped the .BANK file into the sfx folder for the car. I also dropped a GUIDs.txt file into the common SFX folder. After that, the Z4's sound is there but no other cars have sound. I've tried undoing the overwrite, but I've had no luck. Can someone either send me a copy of their GUIDs.txt that comes with the default version of the game or tell me how to get the other sounds back?