Thanks for your reply, but I have tried this command and even reboot the system, and this doesn't works. Note that in Ubuntu, with the same file and program, this steps you describe are enough to get what I want, but doesn't work with fedora.

Thanks!


2013/4/10 Matthias Clasen <mclasen@redhat.com>
On Wed, 2013-04-10 at 17:25 +0200, Víctor Fernández wrote:
> Sorry for taking so much time to reply.
>
>
> My app has a .desktop file, but, what do you mean about "install a
> desktop file"? Is not enough to copy the file
> to /usr/share/applications?
>
>
> I had already changed the mimetipes of my app and this doesn't works.

After changing mimetypes, and copying the file
to /usr/share/applications, you have to run update-desktop-database.