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Navigate to the GTA IV installation folder (e.g., C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto IV\GTAIV ). Create a new text file named commandline.txt and add the following lines:
Open Windows Settings → System → Display → Graphics Settings. Browse and add GTAIV.exe . Set it to “High Performance” (your NVIDIA/AMD GPU). Repeat for LaunchGTAIV.exe . gta 4 fatal error rmn60