Getting an USB USBTMC device into MAX when it doesn�t detect it?

I am trying to control an Agilent 33220A Function Generator over a USB connection.
I am running LabVIEW 7.1, NI-VISA 3.1, and Max 3.1.1.
Windows drivers for the generator are installed, and working. The generator shows up as a "USB Test and Measurement Device". I can connect to it with Agilent’s Waveform Editor.
The problem I am having is the device does not show up in Measurement & Automation Explorer.
I tried using ‘VISA Driver Development Wizard’ to create an inf file, and MAX was then able to detect the generator. However this caused it to be in USB RAW mode. None of the GPIB style commands are working this way.
The generator is USBTMC compliant. How can I get MAX to detect it correctly? As near as I can tell Agilent’s installer wrote all the settings directly into the registry, there is no inf file.
Thanks,
Richard

That’s basically the problem. The generator is currently not associated with NI-VISA. I can get it associated by generating an .inf file with NI’s VISA Driver Development Wizard. But then, when it shows up in MAX it’s a USB Raw Resource. Device ID: USB0::0x0957::0x0407::MY44000798::RAW.
I cannot communicate with it in RAW mode. I need it to show up with an ::INSTR extension.
All the threads I have read indicate that the VISA Driver Development Wizard should only be used for non-USBTMC complaint devices. USBTMC complaint devices are supposed to just show up automatically. Plug-and-Pray isn’t working.
I need to get Agilents USB driver associated with NI-VISA. Not bypass it by creating a raw mode driver. Is there any way to do this?
Thanks,
Richard

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