Arcane mime-type instead of human readable description
Submitted by Bastien Nocera
Created attachment 259308 screenshot
As gnome-boxes is the one "benefiting" from this. The bar here says "Detected as x-content/bootable-media-type".
x-content/bootable-media-type isn't a registered mime-type. So either file a bug against shared-mime-info with a git formatted patch (following its HACKING file, including a test tree), or install your own translated mime-type file which will give a real name to this mime-type.