Thank you for your bug. You need to define a mimetype for the format, yout xournal example has been fixed with the xournal package available on feisty by example. Marking as fixed. If you have a problem with some other type the best way is to open a bug on the package supposed to open it
** Changed in: nautilus (Ubuntu) Sourcepackagename: nautilus => xournal Importance: Undecided => Wishlist Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Fix Released -- "Open with" behaviour by file type does not work as expected with zip archives renamed, such as rosegarden or xournal files https://launchpad.net/bugs/70520 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs