The File Extensions Database

.C4K File Extension

  • Developer by: RedWolf Design
  • Category: Game Files
  • Format: Text

What is an .C4K file?

.C4K is Clonk Key File

File used by Clonk, a strategy game where players control humanoid "Clonks;" saved in plain text and contains an encoded license key used for activating the software; also includes other license information such as an ID, the player name, date of the game purchase, and the software version.

C4K files are used for both offline and online access to Clonk. C4K files that are used by multiple game installations may cause online access to be terminated.

NOTE: C4K files are typically delivered to a user through email after purchasing the software online. This file should be placed in the application directory in Windows to install the license key. For Mac OS X, the C4K file can be opened manually, which will start the game and register the software.

Programs that open Clonk Key File
RedWolf Design Clonk Rage
RedWolf Design Clonk Endeavor
RedWolf Design Clonk Rage
RedWolf Design Clonk Rage

How to solve problems with C4K files

  • Associate the C4K file extension with the correct application. On :
    Windows: Right click on any C4K file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.C4K files". Mac: Right click (or Ctrl-click) the C4K 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 .C4K is Clonk Key File. Because only the current version supports the latest C4K file format. Search, therefore, e.g. on the RedWolf Design manufacturer website after an available .C4K is Clonk Key File update.
  • To make sure that your C4K file is not corrupted or virus-infected, get the file again and scan it with antivirus software.