SUMMARY The issue happens when the user tries to install a user-contributed package in the application/gzip format. STEPS TO REPRODUCE 1. Try to download a new login screen or global theme 2. If the extension is .tar.gz the decompression fails with the message: ``` Installation of /tmp/kyjVyQ-BeautifulTreeAnimation.tar.gz failed: Could not open package file, unsupported archive format: /tmp/kyjVyQ-BeautifulTreeAnimation.tar.gz application/gzip ``` Here is a screenshot: https://invent.kde.org/plasma/systemsettings/uploads/eed9750d9cab0bf8aac74f9feb913c70/Screenshot_20230807_045742.png SOFTWARE/OS VERSIONS Linux: 6.4.8-zen1-1-zen (64-bit) (Wayland) KDE Plasma Version: 5.27.7 KDE Frameworks Version: 5.108.0 Qt Version: 5.15.10