Dear @vix
I’m afraid there is no option to limit the access through WMDC.
What you could do as an alternative:
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Disable WMDC/ActiveSync on the device side
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Enable USBRNDIS to create a virtual network card over USB
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Configure SMB to share selected folders on the network. The folders can then be accessed either through the regular Ethernet, or through USBRNDIS.
Regards, Andy