Server 2012: File Sharing with VPN / RAS

Hi,

I try to get file sharing over VPN working on Server 2012.

The problem is, that the VPN / RAS Dial-In network is categorized as public network and there's no possibility to change it to private.

Thus I can't turn on file sharing for this network.

Any ideas how to turn on file sharing for a RAS Dial-In network or how to change the RAS Dial-In network to private?

Regards,

Freeze