OpenVPN Connect is the official, full-featured OpenVPN client for Windows, designed to provide a secure and reliable way to connect to OpenVPN-compatible servers, including OpenVPN Access Server and CloudConnexa . Since the OpenVPN protocol is not natively built into the Windows operating system, this third-party client is required to encrypt and tunnel your data.
If you want the VPN to connect automatically before login or on system boot: openvpn connect for windows