It looks like there was a mime type definition in ~/.local/share/mime/application/x-extension-jpg.xml with the following content:
<?xml version="1.0" encoding="utf-8"?> <mime-type xmlns="http://www.freedesktop.org/standards/shared-mime-info" type="application/x-extension-jpg"> <!--Created automatically by update-mime-database. DO NOT EDIT!--> <comment>jpg document</comment> </mime-type> After moving this file, I can open jpg files fine. I am not sure what could have installed this, as I am using a fairly stock Ubuntu install (Breezy upgraded to Dapper), and I cannot recall installing any programs for opening JPGs besides the ones included in the normal install. I don't know if it is relevant, but here are answers to the rest of your questions: $ gnomevfs-info --slow-mime image.jpg Error: File not found $ gnomevfs-info image.jpg Error: File not found > Does running "sudo update-mime-database /usr/share/mime" makes a difference? No. Thanks for the help. Sorry if I wasted your time on this one. -- Nautilus is not letting me open .jpg files in Dapper https://launchpad.net/bugs/42992 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs