upgraded MW to 1.30 - maybe things are slightly less broken
Xfinity XW2 (PXW02ABA)
802.11ac WiFi Adapter for IP Client Set-Top Box
The User Manual at the FCC says, "Your PXW02ABA USB WiFi adapter is designed to work with a Pace PX032ANI set-top box.
The PXW02ABA USB WiFi adapter enables your set-top box to connect to your home wireless network and access additional content."