You can't force it to open in that program from your browser. But you can force the image to download, and it will open in whatever picture viewer they have set as a default on their computer.
I use
this force download script. It's not the easiest to implement, but unlike other force download scripts I have used, this one seems to work in all situations. If you have some php knowledge it should be fairly easy to implement. If you don't have php knowledge, you are probably screwed.