The File Extensions Database

.IDLK File Extension

  • Developer by: Adobe Systems
  • Category: Misc Files

What is an .IDLK file?

.IDLK is Adobe InDesign Lock File

Source control file created when an InDesign (.INDD) file is opened; allows the file to be "checked out" and prevents the InDesign document from being edited by more than one person at a time.

InDesign lock files typically use the following filename convention: "~[INDD filename]~[random string].idlk." They are saved in the same folder as the InDesign files they represent. Leftover IDLK files can be deleted after the InDesign application has been quit.

Programs that open Adobe InDesign Lock File
Adobe InDesign CC 2019
Adobe InDesign CC 2019

How to solve problems with IDLK files

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