Preview of TGA files in Nautilus

Hi, Before I install EoG and libjpeg (in one step) I could see TGA files in Nautilus (as thumbnails) but Nautilus would not launch any application nor viewer to see them. I couldn't view JPEG so I installed libjpeg and EoG. Now JPEG are preview in Nautilus and EoG is started when I want to open them. I don't understand why I can't anymore view TGA thumbnails now. In GTK2 there is a module to load tga files (/opt/gnome/lib/gtk-2.0/2.2.0/loaders/libpixbufloader-tga.so). Why neither Nautilus, neither EoG use this loader ? Why EoG could not open TGA files ? Regards, M.B.