Title: Change default application for xdg-open
       Author: Solène
       Date: 25 June 2018
       Tags: unix
       Description: 
       
       I write it as a note for me and if it can helps some other people,
       it's fine.
       
       To change the program used by **xdg-open** for opening some kind of
       file, it's not that hard.
       
       First, check the type of the file:
       
           $ xdg-mime query filetype file.pdf
           application/pdf
       
       Then, choose the right tool for handling this type:
       
           $ xdg-mime default mupdf.desktop application/pdf
       
       Honestly, having firefox opening PDF files with GIMP **IS NOT FUN**.