text/html; firefox %s >/dev/null 2>&1; nametemplate=%s.html; test=test -n "$DISPLAY";
text/html; elinks %s; nametemplate=%s.html; copiousoutput
application/pdf; mutt_bgrun /usr/bin/zathura %s >/dev/null 2>&1;
image/png; mutt_bgrun sxiv %s >/dev/null 2>&1;
image/jpeg; mutt_bgrun sxiv %s >/dev/null 2>&1;
video/mp4; mutt_bgrun mpv %s >/dev/null 2>&1;
application/vnd.ms-excel; mutt_bgrun libreoffice %s >/dev/null 2>&1;
application/vnd.oasis.opendocument.text; mutt_bgrun libreoffice '%s' >/dev/null 2>&1;
application/vnd.openxmlformats-officedocument.wordprocessingml.document; mutt_bgrun libreoffice '%s' >/dev/null 2>&1;
application/vnd.oasis.opendocument.spreadsheet; mutt_bgrun libreoffice '%s' >/dev/null 2>&1;
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; mutt_bgrun libreoffice '%s' >/dev/null 2>&1;