I'm guessing you already noticed this, but on the page you link to, it says "This white paper provides guidelines and key steps for software developers on how to call the
Windows mobile broadband API" so I'm guessing the interfaces/API only exist in the mobile OS .NET.
(Windows Mobile) broadband API or Windows (Mobile Broadband) API
In this case the 2nd reading is correct and it does apply to the "big" Win7. The OP did not mention wherher he has some MB device on the machine. Maybe the interface provider won't work until some MB driver is installed.