xdg-mime default augmented-open.desktop x-scheme-handler/file-line-column This registers the augmented-open.desktop handler as the default handler for URLs using the file-line-column:// protocol.

if i command xdg-mime query default x-scheme-handler/magnet i get qbittorrent.desktop result.

xdg-mime query default text/html To find out what application is going to be used

xdg-mime query default x-scheme-handler/magnet