Hi Johan,
I'd think it might be "openvpn" rather than "OpenVPN", but I am not a Fedora user. I found this:
https://fedora.pkgs.org/36/fedora-updates-x86_64/openvpn-2.5.7-2.fc36.x86_64.rpm.html
But it does not list anything in /etc/default in that package.
You'll need to try to identify what package put that file there. That's of course a Fedora question, not an openvpn one. Good luck.
regards, rob0