If you have NX open...(at least in NX10 it is here)
Menu -> Help -> Online Technical Support -> Download NC Postprocessor
You must have a CAM part open to make that menu pick visible
Note also there are sample machines in
(NX install folder)\MACH\resource\library\machine\installed_machines\...
Production: NX10.0.3.5 MP5 + patch/TC11.2
Apparently I've turned into a gearhead