start-process doesn't do gnome-open or xdg-open.

[Nobuko Three <nbko3@yahoo.com>]

None of the following works as I expected.

;; 1. Try to open a png file with gnome-open from within emacs
(start-process "file-opening" "*file opening*" "gnome-open" "/t/e.m.png")

;; 2. ... with xdg-open.
(start-process "file-opening" "*file opening*" "xdg-open" "/t/e.m.png")

It just writes `Process file-opening finished' in the *file opening* buffer
and image viewer is not launched. How can I make this work?

They work in the shell. The image viewer, eog or Eye of Gnome, is launched
if I enter the following in a terminal:

$ gnome-open /t/e.m.png
$ xdg-open /t/e.m.png


start-process starts eog fine from the following code:
(start-process "file-opening" "*file opening*" "eog" "/t/e.m.png")

It also starts nautilus and gedit fine.
(start-process "file-opening" "*file opening*" "nautilus" "/home/")
(start-process "file-opening" "*file opening*" "gedit" "hello.txt")
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