Note : Firefox ouvre les fichiers avec Gedit/Pluma
sed 's#.*octet-stream.*#application/octet-stream=gnome-open.desktop#' ~/.local/share/applications/mimeapps.list -ised 's#.*octet-stream.*#application/octet-stream=gnome-open.desktop#' ~/.local/share/applications/mimeapps.list -i