File type association changes aren't applied. Reproducible: Always Steps to Reproduce: 1. Try to change the default application to opening a file through the System Settings or the "Open as..." context menu on Dolphin 2. Apply the changes 3. Double-click on a file of that type Actual Results: The file opens with the same application as before. The changes haven't been applied. Expected Results: It should open with your custom entry. I believe that this happened because it didn't ask me to enter my password. Changing the file association by opening the system settings as root worked as expected.
Try to change the default application for a file type*
Moving to relevant KCM
*** Bug 365224 has been marked as a duplicate of this bug. ***
Fixed as of KDE Neon 5.7.2.