SUMMARY It would be useful if Dolphin's "Open archives as folder" feature is able to open RAR archives in addition to ZIPs, GZs, and 7Zs, which seems to be to be contributed by kio-extra's protocols. STEPS TO REPRODUCE 1. In Dolphin, go to "Configure Dolphin" > "Navigation" and enable "Open archives as folder" to turn on opening archive files within Dolphin. 2. Open a RAR file. OBSERVED RESULT The RAR file is opened with the application otherwise registered for it (Ark, for me). EXPECTED RESULT It would be nice if the RAR file is opened within Dolphin. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.6.8 KDE Plasma Version: 5.18.4.1 KDE Frameworks Version: 5.69.0 Qt Version: 5.14.2 Thanks :)