I lost some time figuring out how to associate “.stl” extensions with Slic3r. Gnome wrote a good documentation but it is not obvious to find. I did not use the package manager for that because I wanted the up to date AppImage.
<?xml version="1.0"?> <mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'> <mime-type type="application/octet-stream"> <glob pattern="*.stl"/> </mime-type> </mime-info>
[Desktop Entry] Version=1.0 Type=Application Name=Slic3r Icon=/opt/AppImages/icons/Slic3r.ico Exec=Slic3r Path=/opt/AppImages/ NoDisplay=false Categories=3DGraphics;Utility; StartupNotify=false Terminal=false MimeType=application/octet-stream