They pretty much all use WFP nowadays, the same driver as Windows Firewall: https://msdn.microsoft.com/en-us/library/windows/desktop/aa366510(v=vs.85).aspx
Windows Firewall > Outbound Rules > New Rule > Custom > follow the wizard and just enter the remote IP addresses. Using the .bat provided in the link is a whole lot faster. Either way achieves the exact same thing - and one method is not any better than the other.
