CNF File Type

- The quick facts

What are CNF files and how to open them

Are you having problems opening a CNF file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a CNF file?

Files that contain the .cnf file extension are most commonly associated with telnet connection files. These CNF files store the information that the computer uses in order to make a telnet connection.

Files with the .cnf extension may contain the name of the telnet server that is being used as well as the username and the password of the telnet user. The CNF file that is used by the server software works like a shortcut, allowing users quick access to commonly-used telnet sessions.

Lotus 1-2-3 has also been known to use the .cnf file suffix. These CNF files contain the configuration files that are referenced during the use of the Lotus 1-2-3 application.

How to open CNF files

Important: Different programs may use files with the CNF file extension for different purposes, so unless you are sure which format your CNF file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 8 different CNF openers which you will find listed below.

Last updated: July 13, 2020

Suggest another file format using extension CNF

While we know of one file format using the .CNF file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CNF file.

Various apps that use files with this extension

These apps are known to open certain types of CNF files. Remember, different programs may use CNF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

PCSX2 - Playstation EmulatorPCSX2 - Playstation EmulatorUser submitted
Notepad++Notepad++User submitted
Co*STARCo*STARUser submitted
Direct KiSSDirect KiSSUser submitted
Any Video Converter FreeAny Video Converter FreeUser submitted
We have not verified any software that we know for certain will work with CNF-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CNF-files. If you know one, please use the 'Suggest a program' link below and tell us about it!