Maybe I was not clear..
I use sr-speedbar WHICH *uses* Emacs speedbar. The configuration
(setq speedbar-show-unknown-files t)
regards Emacs *speedbar* NOT sr-speedbar, and is non sufficient to show
dod files (.emacs, .emacs.d, .bashrc...). For sr-speedbar the
configuration starts with "sr-speedbar-..." NOT with "speedbar-..."
OK, forgot sr-speedbar and consider this:
When one enable speedbar and select "Show All Files" in its menu
(mouse-3), files like .emacs, .emacs.d, .bashrc, .profile and so on are
NOT shown...