OpenVPN for Windows have user and password saving ability in the application and these steps are no longer required.
it is only applicable for mobile/ios devices.
BUT
it has workaround tho but not efficient way
Go to settings option in Openvpn then go to advanced tab and then copy mo yung configuration file folder. Next Create a file in the OpenVPN/config folder named password.txt
Note: Punta ka sa folder ng config na gusto mo lagyan
On the first line type your user name.
On the second line type your password.
Edit the .ovpn file referenced above in your launch string and find the line that reads 'auth-user-pass'.
Change it to 'auth-user-pass password.txt'. Save and exit.