I'm porting an NDIS miniport driver for a WLAN device from XP to Vista. This
driver supported an IOCTL interface for query/set requests from the client
application.

Following the mux sample driver in the WDK, the driver now calls
NdisRegisterDeviceEx() to register the device. Stepping through this in
WinDbg, I see the call succeed and return NDIS_STATUS_SUCCESS. However, when
the client application calls CreateFile(), the call fails and GetLastError()
returns 53 (ERROR_BAD_NETPATH).

This was seen on Vista build