Just to make things clear. There is in universe gnome-raw-thumbnailer that do the job. Having it installed by default would help. BUT there is also a bug in the thumbnailing code in gnome that make this fail with some files like Canon CR2. That needs to be addressed upstream.
I'm not especially working on it. ** Changed in: nautilus (Ubuntu) Assignee: Hubert Figuiere => Ubuntu Desktop Bugs -- allow RAW pictures thumbnailing https://launchpad.net/bugs/6090 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs