This sounds just like the question I answered
here. To repeat myself, MAX is a National Instruments utility program. It cannot detect boards from other manufacturers nor should it be expected to. To use existing LabVIEW drivers, you will have to replace every instance of built-in GPIB Write/Read or VISA Write/Read with the equivalent functions from Quancom. The posted example makes a call into the Quancom driver. The built-in LV functions makes a call into either NI-GPIB.DLL or NI-VISA.DLL. That is why the prewritten drivers don't work
and has nothing to do with MAX registering it. This is one of those instances where saving a little bit of money on hardware is going to be offset by the amount of time spent modifying the existing drivers.