I can confirm this. To reproduce, I tried with the Ubuntu Smooth Orange theme's index.theme file (http://www.gnome-look.org/content/show.php?content=37533 ). Nautilus displays that icon as "Human" and cannot open the theme file.
I have attached a screenshot of the same. When I right click on the file, there is no "Open with.." item in the context menu, so indeed, there appears to be no way to open that file in a text editor using Nautilus. To reproduce, you don't need theme. Any text file named foobar.theme will display the same behaviour. ** Attachment added: "Screenshot showing the .theme file problem." http://librarian.launchpad.net/1983006/theme-shot.png -- Wrong recognition of .theme file https://launchpad.net/malone/bugs/38434 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs