Comment 7 for bug 183368

ok... found the nature of the problem

The python script needs to be made executable.

It looks like When you set Type=Application gnomedesktopitem will not load the key (even if you use the get_string) if the file isn't executable. Umm... there's a few ways to work around this cleverness.... I'm not sure what the best one is.

But expect a fix sometime today.