Getuidx64 Require Administrator Privileges Exclusive Access

Windows isolates processes running under different users. If you are a standard user, you cannot query the details (like the User ID) of processes owned by other users or the SYSTEM account.

Graphics injectors often use getuidx64 to verify they are running with sufficient rights to hook into DirectX or Vulkan. When Windows User Account Control (UAC) blocks part of the injection chain, the mod fails.