openvpn T22P to router ASUS RT N66U - create ca.crt, client.crt and client.key files

[kooskoets]

I have a Yealink T22P that I want to connect to a remote router. I downloaded the client.ovpn from the router.

I read the Yealink openVPN technical documentation about 10 times. It explains how to set up a server on Linux or Windows and then to put the ca.crt, client.crt and client.key in a .tar file.

But I already have a server set up! And all I have is a client.ovpn file.

How do I create these three files from the client.ovpn file that I have?

On the router I can copy and paste all three key files as a text. Can I just copy and paste this into a text file, and change the name and extension??

Or should this be done differently?