FC 17 Nautilus menu "open with"

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http://forums.fedoraforum.org – Hello to everybody, I developed a graphical application to display custom image files taken by our own developed IR camera, with a custom format. I would like to open the files with that application even from Nautilus and not only from command line (<applicationan_name> >file_name>), but when I open the menu "open with" my application is not shown, and there is no way to define a user application. In addition, in the "open with" with menu, it propose application that aren't even installed anymore. How to customize the "open with" menu? Thanks a lot (HowTos)