The Postscript file type is mainly associated with Text, AcroDist, XnView, Access with Ghostscript, and with the following MIME types: application/postscript, application/ps, application/x-postscript, application/x-ps, text/postscript, application/x-postscript-not-eps
This SonicWALL signature identifies HTTP downloads of Content-Type: text/postscript.