Comment 17 for bug 50320

IMHO this should be a control panel and wether it's in the file manager it's up to the manager itself.
That's because Konqueror and Dolphin are/were the DEFAUL file managers that KDE uses. They are not the only one (e.g. Krusader) and just like in windows it is not the file manager that uses file associations to run the correct app with a file. For example a correctly written KDE aware app can use the associations as well to open files. Why putting it to the only one file manager, that doesn't even appear in this process.

Anyway forwarding the bug to the Dolphin dev team doesn't at all help us to quickly fix the problem which originated from Kubuntu introducing the system-settings.