Thank you for your answer, Jonathon. I have found that the problem ocurs only with programs that make use of glade files for the interface. With pure pygtk programs without using glade files, making a launcher with a simple double click works perfectly. But if the program builds his interface basing in a glade file, that doesn't work. The mime type is ok, and I have tried your proposal, but it doesn't work with those programs. I'll keep trying to find the reason. I'll tell you if I find it. I have wroten to gnome-devel about this, and they have recommended me to have a look at the source from "orca", a gnome application that makes use of glade files, so I'll have a look at it...
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