Darryl> Oliver Graf <ograf(a)fga.de&gt; wrote: Darryl> I believe TM is responsible. Darryl> TM will also guess the type based upon the file extension (see the Darryl> alist, "mime-file-types", in tm/tm-edit.el). There are even entries for Darryl> the extensions ".diff" and ".patch"; unfortunately, the defaults for Darryl> these are application/octet-stream (I'd like to change them to Darryl> text/plain w/base64 -- any comments?). For unrecognized files, the Darryl> default is also application/octet-stream. I have the same comment as Jan Vroonhof: patch files having an application/octet-stream type is not a bug it's definitely a feature. Patch files are input for the patch program not plain text. I agree however that TM should provide a means to display application/octet-stream typed attachments as text on user request (what I currently do in Gnus is toggle MIME processing on and off with 'W m'). I think you should not change the patch type to text/plain without thoroughly checking it won't break patches containing multi-byte characters. Oscar