Doing pretty good with Kubuntu 12.04, but I can't figure this one out.

Using Firefox on Yahoo mail, I get an Image.jpg file, I click the file and a box
comes up with two choices, Open with (Browse) or Save File.

If I Save File, it goes to my downloads folder, I go there and click on it and
it opens in Gwenview.

If I tick Open with and Browse, a 'Choose Helper Application' comes up, but I
can not get Gwenview to appear, if I click the search option, type in
'Gwenview'. then hit enter, nothing happens, there is no button to click.

It is a pain to go to the downloads folder to see each picture and most of them
I don't want to keep any way and then I have to delete them.