As Brian said in another post "nope, sorry won't work"
By all rights mach shouldn't work under windows at all. Art has taken some liberties with the OS kernel to get a steady pulse stream out of the parallel port. More or less he has taken control of the parallel port away from windows and is flipping bits by hand. Anything other than a cable between mach - parallel port - machine is going to use windows to handle the data.
The other problem, Most rf transmission systems like 802.X is packetized ip. Not suitable at all for things that need a rock solid pulse train, like step and direction for machining.
Now you are probably saying to your self, but what about the g-Rex, it is Ethernet. Well mach is sending a X10 and the grex probably sends a ack, OK Moving, then it counts and sends the pulses. I probably shouldn't be, but i am using my grex wirelessly with almost no problems.
Chad