Some code uses "Microsoft.SPOT.Hardware.UsbClient" which is not listed when adding resources

I am using Visual C# 2010 Express and trying to the Fez Panda I communicate with the PC.
I am using code someone else created.

I need to know how to add a reference to Microsoft.SPOT.Hardware.UsbClient which is not in the selection list.

Please help, I am very new to this.

K