The most common reason users search for this keyword is because flags oem56.inf as an "incompatible driver". This alert completely blocks you from activating Memory Integrity (Hypervisor-protected Code Integrity / HVCI) .

: If a system has multiple drivers for the same device, Windows may designate one as the "exclusive" or active driver based on its digital signature or version date. Technical Role of the INF File

If you provide more details, I will write a complete, well-researched, original article — including:

to avoid naming conflicts in the system's driver store. Because these numbers are assigned sequentially as drivers are added, "oem56.inf" does not belong to just one product