.EFK File

.efk is Ensoniq KT File

Key Features: .EFK File Extension

Sound format used by the Ensoniq KT music production studio

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