If used on a machine (whether Win32 or CE/WM) that has Widcomm only installed[1], but no 32feetWidcomm.dll install alongside then we simple throw the general error: PlatformNotSupportedException("No supported Bluetooth protocol stack found.")
We can be much more helpful by doing a manual check to see if the Widcomm stack seems to be installed (e.g. LoadLibrary("wbtapi.dll")), and _if_ 32feetWidcomm DLL is not installed then report that it is required. We've got this requirement in various documents but this is much more helpful.