The File Extensions Database


.CK5 File Extension

  • Developer by: id Software LLC
  • Category: Game Files

What is an .CK5 file?

.CK5 is Commander Keen 5 game data

The CK5 file extension is associated with the Commander Keen computer game series, originally created by id Software in 1990.

The .ck5 files contain data of the second episode of the second series Goodbye Galaxy!, called The Armageddon Machine, also known as Commander Keen 5.

This ck5 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.


How to open:

Use TED5 to edit game data from Commander Keen 5.

How to convert:

As far as we know, this .ck5 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

How to solve problems with CK5 files

  • Associate the CK5 file extension with the correct application. On :
    Windows: Right click on any CK5 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CK5 files". Mac: Right click (or Ctrl-click) the CK5 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CK5 is Commander Keen 5 game data. Because only the current version supports the latest CK5 file format. Search, therefore, e.g. on the id Software LLC manufacturer website after an available .CK5 is Commander Keen 5 game data update.
  • To make sure that your CK5 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.