SUMMARY *** From a flatpack install of Falkon, downloading zip files when asking where to save strips the extension from the end of the filename. NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Go to https://vanillatweaks.net/ 2. build a resource pack 3. download it and save it without any name changes OBSERVED RESULT file downloads without extension, kde realizes its a compressed file, but other apps (in this specific case minecraft) need the extension to remain EXPECTED RESULT SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 6 KDE Frameworks Version: 6 Qt Version: 5.15 ADDITIONAL INFORMATION I note that while neon's kde 6 is on qt 6, falkon's flatpak is on 5.15, and the deb available to neon (based on ubuntu) is further behind.