For a step-by-step visual guide on fixing the RMN60 error and other launch issues in GTA IV:
The Vulkan backend handles memory allocation properly. No RMN60, plus better frame pacing and fewer shadow glitches.
Windows Defender or third-party AV (Avast, Norton) may quarantine secDRV.sys or block GTAIV.exe .
resolves launch errors and performance issues by updating internal game parameters to work with modern hardware. You can find instructions and files on GitHub - ThirteenAG/GTAIV.EFLC.FusionFix Update Graphics Drivers
Find the main executable file, usually named or PlayGTAIV.exe . Right-click the file and select Properties . Navigate to the Compatibility tab.
The RMN60 error exists because GTA IV’s PC port was outsourced, and the source code for the renderer was poorly documented. When Rockstar released the "Complete Edition" in 2020, they removed Games for Windows Live (GFWL) but did not rewrite the memory management. As GPUs surpassed 2GB, 4GB, and 8GB, the 2008 code simply overflowed.