CK4 file format description

Many people share .ck4 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ck4 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ck4 files.

1 filename extension(s) found in our database.

.ck1 - Commander Keen Data File

The CK1 game data files are related to Commander Keen. The CK1 file is a Commander Keen Data File. Commander Keen is a series of video games developed by id Software in the early 1990s.

Commander Keen
Game Data files
- / -
ck2, ck3, ck4, ck5, ck6
Commander Keen Data File related extensions:
World Cricket Championship 2 Game Data
SimCity Societies Game Data
Unreal Tournament 2003 Module
The Club Data
Warlords Battlecry Game Data
Taikojiro Song Map Sequence

Naturally, other applications may also use the .ck4 file extension. Even harmful programs can create .ck4 files. Be especially cautious with .ck4 files coming from an unknown source!

Can't open a .ck4 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .ck4 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

c4, c4k, ck, ckt, cl4, cm4, k4, vk4

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Keyence VK Series Data
DataFlex Index
Easy CD Creator 4 Project
CircuitMaker Document
Ansys Chemkin Thermodynamic Data
Edmics Image

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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If you have useful information about the .ck4 file format, then write to us! >> CK4 file