FTDI Q&A

Q: How can I make FTDI Chip’s ICs appear as a different USB device class?
A: FTDI has defined its own device class, so FTDI devices return a 0 for the bDeviceClass (Vendor class). The class cannot be configured by the designer. FTDI devices do not return the correct USB device descriptors to be USB HID class or USB Mass Storage class. It may be possible to write a filter driver that will make our chip appear to be a HID or mass storage class device, but to do this would involve a lot of work.

http://www.ftdichip.com/Support/FAQs.htm#General1

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