Various experimental installers, drivers and packages are listed on this page. They may or may not be production quality. 

||OpenVPN 2.3.4 with NDIS 6 drivers (32-bit)||[http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I602-i686.exe openvpn-install-2.3.4-I602-i686.exe]||[http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I602-i686.exe.asc GPG signature]||
||OpenVPN 2.3.4 with NDIS 6 drivers (64-bit)||[http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I602-x86_64.exe openvpn-install-2.3.4-I602-x86_64.exe]||[http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I602-x86_64.exe.asc GPG signature]||
||Tap-windows6 (NDIS 6) driver installer||[http://swupdate.openvpn.org/community/releases/tap-windows-9.21.0.exe tap-windows-9.21.0.exe]||[http://swupdate.openvpn.org/community/releases/tap-windows-9.21.0.exe.asc GPG signature]||