A CHA file is a user settings file created by the IRC clients such as mIRC. It contains parameters such as the server, port, channel name and, optionally, a password for opening an IRC channel. IRC clients are used to communicate with others on the IRC networks around the world. These are used for one-to-one private discussions or in multi-group conferences. When a CHA file is clicked, the IRC client automatically opens with the details mentioned in the file.
Applications that can open CHA files include mIRC and Visual IRC.
CHA File Format
CHA files are stored alongside other installation files of the IRC client. When a user wants to connect to a server and join a channel, he enters the information in the client. This information is stored in the CHA file that can be retrieved at any time.