Not able to set device friendly name using Extension INF for the PCI device

HI ,

Trying to install Extension INF on top of PCI based driver .
device friendly name is not reflecting in the device manager and in registry settings
but other settings are reflecting in the registry entry .

Pleas kindly do needful .

Note: With sample Class name and GUID in base INF file it is working fine, problem only if i changed Class name = NET/class GUID = {4d36e972-e325-11ce-bfc1-08002be10318} in base INF