I am using the xdg utility to attempt to associate a image with a file association.
I have ran this command and the equivalent for 48,64 and 128 sizes, none of them seem to have an effect.
xdg-icon-resource install --context mimetypes --size 256 image-256.png text-abc
Any ideas?
This is incredibly lame - but I have managed to get this working once, I had run the above command, then I changed the network bridge on my virtual machine from wireless to wired, and this somehow had a knock on effect to changing the ubuntu theme (the window headers changed from the usual orange to blue) and all the 'abc' files I had on the desktop had the image I've specified.