[Default Applications]
application/pdf=zathura.desktop;
application/tex=zathura.desktop;
image/png=phototonic.desktop
image/jpeg=phototonic.desktop;
video/mp4=mpv.desktop;
video/mkv=mpv.desktop;
inode/directory=pcmanfm.desktop

[Added Associations]
image/png=phototonic.desktop;

[Removed Associations]