virtual network interface for windows

Question

I'm developing sort of VPN application and need virtual network interface (aka TUN/TAP). Is there any such driver available for windows ?

The only one I know of is OpenVPN, but it is GPLed and thus AFAIK can't be used in closed-source app.

If there's no ready solution, I'd appreciate some estimation on how complicated is it to code such beast myself (and possibly some direction on where to start).

I found this similar question, but it dated back 2008.

Answer 1

Found this one: wodVPN - claims to come with a virtual network adapter.