Looking for a way to determine wich Network adapters are truly Wired ethernet.

Question

I'm Working on a little app that is going to validate that the machine is connected to a wired network before we allow it to start a re-installation of the operating system. Our wireless net works great for installed systems (they do have a machine certificate)
but we cannot install on it (since the machine must be domain joined to get that cert)
So far I have not found any method that truly tells if the card is a wired network adapter. 
Win32_NetworkAdapter:s AdapterTypeID does not work since many wireless adapters report type=0 wich should be wired adapters. 
MSNdis_PhysicalMediumType does not work. It returns undefined for a number of adapters
Many posts on the net talks about detecting the connection state wich doesn't work either since it will return the same value for a connected wired adapter and a connected wireless adapter
Other posts suggests using powershell and looking at tha dapter name. That doesn't work if you
got to support a number of languages and what happends if a user renames the interface?
The only way I can make it sort of work is to pipe the output from netsh LAN show interfaces and then do queries on those adapters but I would prefer a soloution in Code. 
Since Netsh can do it, there must be a way to do this

Answer 1

The reason for the C code not running under WinPE was user error ........
Forgot to link it static.
I have been digging around some more and so far the only API that will give us the correct and complete picture seems to be GetIfEntry2, however I can't find dotnet code for it. 
It seems like most other methods uses the older GetIfEntry under the hood and that will not give us the true data since many types will report as NDisPhysicalMediumType 0. 
However a combination of Win32_network adapter and MSNdis_PhysicalMediumType actually seems to work.
Win32_network filtered on AdapterType='Ethernet 802.3' gives us everything that claims to be an ethernetadapter. That list will however include wireless, bluetooth and some virtual adapters. 
MSNdis_PhysicalMediumType filtered on NDisPhysicalMediumType 0 does not show Wireless or Bluetooth but will instead show isatap interfaces and so on. 
The Key was to "join" these two on win32_networkadapter.Name to MSNdis_PhysicalMediumType.Instancename giving us the possibility to filter out the unwanted adapters using both methods. 
I have made a demoscript that became embarrassing short 
'* ListPhysicalAdapters.vbs
'* Purpose : A script to list the true Physical Ethernet adapers.
'* Created : 2005-02-17
Dim colItems_Win32_NetworkAdapter, Colitems_MSNdis_PhysicalMediumType
Dim objNetworkAdapter,objPhysicalMediumType
' Select the adapters that claims to be 802.3 aka ethernet adapters. This will hoverver get anything calling itself an Ethernet adapter
Set colItems_Win32_NetworkAdapter = GetObject("winmgmts:\\.\root\cimv2").ExecQuery("Select * from Win32_NetworkAdapter where AdapterType='Ethernet 802.3'",,48)
For Each objNetworkAdapter in colItems_Win32_NetworkAdapter
  ' Select the adapters that claimed to be Ethernet Adapters above and filter out the ones who doesn't have an Ethernet Connector (type=0 is used for fallback/undefined)
  Set Colitems_MSNdis_PhysicalMediumType = GetObject("winmgmts:\\.\root\WMI").ExecQuery("SELECT * FROM MSNdis_PhysicalMediumType where InstanceName='" & objNetworkAdapter.Name & "' AND (NdisPhysicalMediumType=0 OR NdisPhysicalMediumType=14)",,0)
  For Each objPhysicalMediumType in Colitems_MSNdis_PhysicalMediumType
    Wscript.Echo "AdapterType: " & objNetworkAdapter.AdapterType & ""
    Wscript.Echo "MACAddress: " & objNetworkAdapter.MACAddress
    Wscript.Echo "Name: " & objNetworkAdapter.Name
    Wscript.Echo "PhysicalMediumType: " & objPhysicalMediumType.NdisPhysicalMediumType
Wscript.Echo ""
  next
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