obsolete MIME compliant
:type "TEXT" :content-type "text"
:type "GIF" :content-type "image/gif"
:type "TIFF" :content-type "image/x-tiff"
:type "PS" :content-type "application/postscript"
:type "WSRC" :content-type "application/x-wais-source"
:type "MIME" :content-type "message"
excuse the novice question, but doesn't x-tiff and x-wais-source imply that
a particular program (running on an X Windows display) is to be called?
how do you support other platforms?