Ihv Gui Mui 64 Access Denied Jun 2026

Modern IHV anti-cheat or DRM drivers (NVIDIA’s NVFBC, AMD’s AGS) register as Protected Process Light. Their GUI tools, however, do not. When a PPL-protected driver creates a shared memory object but restricts it to only other PPL processes, the standard user-mode GUI is locked out. The developer intended a graceful fallback. There is none.

The error means that Windows User Account Control (UAC) or file permissions are preventing the executable from accessing this specific system file, often due to security restrictions, file corruption, or incorrect ownership. ihv gui mui 64 access denied