There is only one file type that uses the .OVPN extension:
OpenVPN Configuration File
Stores connection settings for an OpenVPN session; used for creating a VPN connection with a remote computer; can be opened directly by OpenVPN to start a VPN session.
OpenVPN configuration files should be stored in the "\Program Files\OpenVPN\config" directory in Windows.
NOTE: In Windows, configuration files are named "server.ovpn" and "client.ovpn." On Unix systems, they are named "server.conf" and "client.conf."
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Updated: November 1, 2008