how to write a class driver for windows IOT core device ?

Hello Tim,
Yes I really got confused.
The thing I wanted to achieve is, I am trying to enable USB device functionality on my Tiny Windows IoT Core board. When I connect it to other HOST PC it should be recognised as a COM PORT device. And I need to send some sensor data(Text) over it.

Here the only thing I wanted to achieve is to build communication between User application and GenericUsbFn.sys.
So to do that I need an InterfaceGUID to be available @user Application which gets the symbolic link of the GenericUsbFn.sys etc…

I have set all the Configurations which I expected to do by the driver by using the following link “https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-registry-settings-for-a-function-controller-driver
However I am not seeing GenericUsbFn.sys in running state at all even after UFX01000.sys started running along with UFXSynopsys.sys.

Kindly let me know what are all the conditions should be satisfied to bring the GenericUsbFn.sys into running state and what would be the InterfaceGUID to be used to communicate with it from USER APPLICATION.

More details:
OS: Windows 10 IoT Core (ver-10.0.17763.253)

I respect all your answers. Thank you
Regards
Lokesh