Include many more files in binary-file-regexps, files.el. lisp/ChangeLog addition: 2011-09-21 Aidan Kehoe <kehoea@parhasard.net> * files.el (binary-file-regexps): Update this, adding everything that maps to no-conversion or no-conversion-multibyte in GNU's auto-mode-alist. In particular, add PDFs, important given gnus' problem with them of http://mid.gmane.org/m3r637lpm5.fsf@mikesoffice.com and the associated thread, and Uwe's recent re-reporting of the same problem.