CK2 file format description

Many people share .ck2 files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .ck2 file can be edited, converted or printed with. On this page, we try to provide assistance for handling .ck2 files.

2 filename extension(s) found in our database.

.ck2 - ChessBase Strategy Key Data

The CK2 game data files are related to ChessBase. The CK2 file is a ChessBase Strategy Key Data. ChessBase is a personal, stand-alone chess database.

Game Data files
- / -
ChessBase Strategy Key Data related extensions:
ChessBase Annotations
ChessBase Search Booster
ChessBase Commentators Index
ChessBase Hash File of Doubles Data
ChessBase Team Index
ChessBase Old Game 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:
F1 2015 Game Bundle Data
Infinity Engine Creature
Simple Planes Plane Data
Call of Juarez Game Data
Little Busters Game Data
Dota 2 Audio

Naturally, other applications may also use the .ck2 file extension. Even harmful programs can create .ck2 files. Be especially cautious with .ck2 files coming from an unknown source!

Can't open a .ck2 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 .ck2 file extension is often given incorrectly!

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

c2, c2k, ck, ckw, ckz, cl2, cm2, co2, k2, kc2, sk2

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

DataFlex Index
AquaCrop Atmospheric CO2 Data
ACD/ChemSketch Drawing Document
QuickSFV Checksum Database
POV-Ray Include File
Hy-Tek Meet Manager Results Data

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 .ck2 file format, then write to us! >> CK2 file