Docky shows icon according to the filename

I'm running GNOME Do 0.7.98-0 with Docky here...

$ dpkg -l gnome-do* | grep ii
ii gnome-do 0.7.98-0~intrepid~ppa1 Quickly perform actions on your desktop
ii gnome-do-plugins 0.7.98.1-0~intrepid~ppa1 Extra functionality for GNOME-Do launcher

When i open a picture called gajim1.png inside GIMP i don't see the gimp icon inside docky. I see the icon of Gajim. The same happens when you open a file called pidgin1.png inside gimp. Instead of GIMP docky says that you just opened pidgin.

I noticed that this only happens when the application (in this case Gajim or Pidgin) is inside the static area of the dock. When i drop Gajim out of the static area and open gajim1.png inside GIMP the GIMP icon appears inside the "dynamic area" of docky.