Connect OpenVPN on Windows startup.

Adding the following parameter to the "Destination" in a shortcut to opennvpn-gui.exe will make it automatically connect to myprofile.ovpn on startup, and show the classic GUI icon.:

 "C:\Program Files\OpenVPN\bin\openvpn-gui.exe" --connect myprofile.ovpn

Place this shortcut in the All Users Startup Folder

 C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp

if you wish all users should use VPN. If only a certain user shall auto connect then place the shortcut in

 C:\Users\[Username]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup

Press the Windows logo key + R, type shell:startup, then select OK. This opens the Startup folder for current logged on user.

NOTE: the myprofile.ovpn file must be available in the folder

 C:\Users\[Username]\OpenVPN\config\

This works on Windows 10.