Update: the Magazine says Ultra 64 but those captures are from Super Off Road: The Baja for Super Nintendo from Software Creations
Williams Entertainment was one of the first third-party to show support for Nintendo 64 even before the console had that final name and specifications. In fact they showed at E3 ’95 two tech demo, one was No Fear Racing while the other was an off road racing game tentatively called Off Road. It’s very likely that this early demo was the base for the N64 racer Off Road Challenge.
Images taken from Cd Consoles issue 4