Trash applet opens Gimp instead?

This is a very strange one.

When I open Trash, it opens Gimp saying,

Gimp Message Opening 'trash:' failed. Can not recursively copy directory.

I looked in Preferred Applications and found that the File Manager was set to Gimp.

When I changed it to Thunar, my Trash started working properly.

I wonder why Gimp is even offered as a pick?

It is certainly no file manager.