Try this reg edit for PANU mode instead of NAP.
[HKEY_LOCAL_MACHINE\Comm\BTPAN1\Parms]
"BusNumber"=dword:0
"BusType"=dword:0
"AdapterType"="PANU"
"ServiceId"="{00001115-0000-1000-8000-00805f9b34fb}"
"FriendlyName"="Personal Ad-hoc Network"
"Description"="Bluetooth PANU service"
"ConnectionTimeout"=dword:7530
"AcceptConnections"=dword:1
"MaxConnections"=dword:10
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