Change network type to "private"

Hello, I have three network adapters in a computer - two LANs and one WiFi adapter.

LAN1 is domain network (and correctly applies domain firewall profile).
LAN2 is virtualbox virtual adapter, it is always "public". There weren't (and aren't) any options to change it.
LAN2 and WiFi are merged in 'Unidentified Networks' public location.

How do I move LAN2 to "private" location instead?

My desired configuration -
LAN1 stays 'domain'
LAN2 becomes 'private'
WiFi adapter stays 'public'

That way I can config adv.firewall by using profiles (that's how it should be used, isn't it?). As of now, I HAVE to use one profile for all locations (public profile), limit all rules by IP scopes and disable all other profiles to avoid confusion.

System is Windows 7 Professionsl 64bit

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