Fatal Error RMN60 is one of the most frustrating and persistent errors in Grand Theft Auto IV (PC). It typically appears when launching the game via the Rockstar Games Launcher or Steam, often accompanied by the message: "Fatal Error: RMN60" followed by a crash to desktop.
This error is almost always related to SecuROM (an old DRM system) failing to initialize or conflicts with Windows security updates. Below is a step-by-step guide to resolve it.
90% of RMN60 cases are solved by forcing the game to limit its own VRAM usage. You do this by creating a commandline.txt file in the game’s root directory.
This forces the game to bypass its broken auto-detection. how to fix gta 4 fatal error rmn60
Right-click inside the folder, go to New → Text Document.
Name it commandline.txt (ensure it’s not commandline.txt.txt).
Open the file with Notepad and paste the following lines exactly: Fatal Error RMN60 is one of the most
-dx9
-availablevidmem 2048.0
-norestrictions
-novblank
-frameLimit 0
-refreshrate 60
-width 1920
-height 1080
Save the file and launch the game.
Note: Adjust -width and -height to match your monitor’s native resolution. If you have a 4K monitor, try 1920x1080 first.
If none of the above works, the game’s own configuration file may be corrupted. Right-click inside the folder, go to New → Text Document
This prevents the game from overwriting safe settings with RMN60-causing ones.
The RMN60 error often occurs in DirectX 10 or 11 rendering modes. GTA IV was built for DirectX 9. Forcing DX9 can eliminate the depth render target issue.