CK3 file format description

Many people often share .ck3 files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .ck3 files. To address this issue, we have created this page to offer assistance and guidance on handling .ck3 files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .ck3 files.

Our aim is to simplify the process and promote seamless use of the .ck3 file format.

2 filename extension(s) found in our database.

.ck3 - ChessBase Endgame Key Data

The CK3 game data files are related to ChessBase. The CK3 file is a ChessBase Endgame Key Data. ChessBase is a personal, stand-alone chess database.

Category:Game Data files
Magic:- / -

ChessBase Endgame Key Data related extensions:

  • cba ChessBase Annotations
  • cbb ChessBase Search Booster
  • cbc ChessBase Commentators Index
  • cbd ChessBase Hash File of Doubles Data
  • cbe ChessBase Team Index
  • cbf 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.

Application:Commander Keen
Category:Game Data files
Magic:- / -
Aliases:ck2, ck3, ck4, ck5, ck6

Commander Keen Data File related extensions:

  • xsm SimCity Societies Game Data
  • ut2mod Unreal Tournament 2003 Module
  • baf The Club Data
  • xcr Warlords Battlecry Game Data
  • cof Diablo 2 COF Animation Data
  • eff Infinity Engine 2.0 Effects

Be careful.

It is important to understand that the .ck3 file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .ck3 extension to create files. This includes potentially harmful programs or malware that may generate .ck3 files for various purposes. Be especially cautious with .ck3 files coming from untrusted or unknown sources.

Can't open a .ck3 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 an extension, you receive the following message:

Select an app to open this .ck3 file

To set the .ck3 file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .ck3 file association. Many applications can open .ck3 files without requiring any specific file association to be set.

The .ck3 file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

c3, ck, ckw, cl3, cm3, cu3, k3

Is it possible that the filename extension is misspelled?

There is a possibility that the .ck3 filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .ck3:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

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 find the information on this .ck3 page useful, please feel free to link to this page. >> CK3 file