Hello Xiaofan, thanks for the reply. I did create the .inf file &
selected it as the driver to load when the device is attached. My device
shows up with no errors under Device Manager but when I run
testlibusb-win.exe nothing at all is shown (not even for devices that
windows can see). I have also installed the filter package as suggested
by Wander but without success.
 
I also did a completely fresh install of XP & loaded Python, PyUsb &
libusb again. Same result. Then I loaded the filter package. This time
testlibusb shows devices on only 1 bus but not my device. Note that on
Ubuntu, usbenum.py shows 5 busses & all devices descriptors are
displayed.

By the way, the device is something that I am developing. I'm using
vendor specific class & subclass, no protocol. I've developed an
application under Ubuntu & can read & write from the device without
problems.

Thanks
Mark



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