CK6 File

What are CK6 files and how to open them

Are you having problems opening a CK6 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CK6 files.

What is a CK6 file?

A .CK6 file is a Commander Keen 6 Config file.

Commander Keen 6 config is a configuration and saved-settings file used by the DOS game Commander Keen: Aliens Ate My Babysitter (also called Commander Keen 6), developed by id Software and released in December 1991. It stores the game's configuration options (such as display, sound, control settings) and high score data, loaded at game startup and written when the game exits properly.

This format is produced by the game itself. When the player makes changes to settings (for example key bindings, sound/music volume, graphics mode) or earns a high score, those changes are saved into the configuration file so that future sessions start with the chosen preferences and stored high scores. The game reads the file at launch to restore settings.

Files begin with the ASCII‐signature "CK6" followed by a zero byte at file offset 0.

How to open CK6 files

Important: Different programs may use files with the CK6 file extension for different purposes, so unless you are sure which format your CK6 file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 31, 2026

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CK6 file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.