Oliver Graf <ograf(a)fga.de&gt; wrote: I believe TM is responsible. TM will also guess the type based upon the file extension (see the alist, "mime-file-types", in tm/tm-edit.el). There are even entries for the extensions ".diff" and ".patch"; unfortunately, the defaults for these are application/octet-stream (I'd like to change them to text/plain w/base64 -- any comments?). For unrecognized files, the default is also application/octet-stream. -- Darryl Okahata Internet: darrylo(a)sr.hp.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Hewlett-Packard, or of the little green men that have been following him all day.