There is currently no way to query a file's activation URI for extension. I've sent a mail to nautilus-list and hope that we'll be able to fix it soon.
-- "Open Terminal" not shown in context menu for Nautilus desktop items https://launchpad.net/bugs/34261 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
