Because it's a text file, I expect to show it in GEdit. I think that Nautilus recognize it like a folder: in the context menu I don't have "Open with other application".
Now, after the last upgrade Nautilus don't show anymore the file name (index.theme), but the Theme name -- 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