Trying to use w3 to display an html inline message with VM yields the error below. I noticed that variable is set in w3/mule-sysdp.el so it's possible only a require is needed in w3-display.el. Adding one fixed the problem for me but this should probably be verified with the author. Signaling: (void-variable mule-sysdep-version) byte-code("..." [mule-sysdep-version xemacs find-charset w3-dingbats make-charset "Dingbats character set for Emacs/W3" (registry "" dimension 1 chars 96 final ?\:) (4.0 3.0 3.1) charsetp define-charset nil vector 1 96 ?\: 0 "dingbats" "emacs/w3-dingbats"] 13) load-internal("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t nil nil) efs-real-load("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t) load("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t) apply(load ("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t)) dired-handler-fn(load "/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t) load-internal("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t nil nil) efs-real-load("/home/gshapiro/Work/xemacs/xemacs-21.0-b48/packages/lisp/w3/w3-display.elc" nil t t) load("w3-display" nil nil nil) w3-region(1 7239) byte-code("..." [w3-region] 3) vm-mime-display-internal-text/html([("text/html" "charset=us-ascii") ("text/html" "charset=us-ascii") "7bit" nil nil ("inline" "filename=netscape.htm") ("inline" "filename=\"netscape.htm\"") #<marker at 4677 in .vmail 0x87c764c> #<marker at 4805 in .vmail 0x87c7634> #<marker at 12043 in .vmail 0x87fe0d4> nil nil nil]) byte-code("..." [intern "vm-mime-display-internal-" type layout] 3) vm-decode-mime-layout([("text/html" "charset=us-ascii") ("text/html" "charset=us-ascii") "7bit" nil nil ("inline" "filename=netscape.htm") ("inline" "filename=\"netscape.htm\"") #<marker at 4677 in .vmail 0x87c764c> #<marker at 4805 in .vmail 0x87c7634> #<marker at 12043 in .vmail 0x87fe0d4> nil nil nil]) vm-mime-display-internal-multipart/mixed([("multipart/mixed" "boundary=---bOuNdArY---") ("multipart/mixed" "boundary=\"---bOuNdArY---\"") "7bit" nil nil nil nil #<marker at 2563 in .vmail 0x87c78d4> #<marker at 4514 in .vmail 0x87c78bc> #<marker at 12064 in .vmail 0x87c77e4> ([... ... "7bit" nil nil nil nil #<marker at 4577 in .vmail 0x87c7784> #<marker at 4653 in .vmail 0x87c776c> #<marker at 4659 in .vmail 0x87c7664> nil nil nil] [... ... "7bit" nil nil ... ... #<marker at 4677 in .vmail 0x87c764c> #<marker at 4805 in .vmail 0x87c7634> #<marker at 12043 in .vmail 0x87fe0d4> nil nil nil]) nil nil]) byte-code("..." [intern "vm-mime-display-internal-" type layout] 3) vm-decode-mime-layout([("multipart/mixed" "boundary=---bOuNdArY---") ("multipart/mixed" "boundary=\"---bOuNdArY---\"") "7bit" nil nil nil nil #<marker at 2563 in .vmail 0x87c78d4> #<marker at 4514 in .vmail 0x87c78bc> #<marker at 12064 in .vmail 0x87c77e4> ([... ... "7bit" nil nil nil nil #<marker at 4577 in .vmail 0x87c7784> #<marker at 4653 in .vmail 0x87c776c> #<marker at 4659 in .vmail 0x87c7664> nil nil nil] [... ... "7bit" nil nil ... ... #<marker at 4677 in .vmail 0x87c764c> #<marker at 4805 in .vmail 0x87c7634> #<marker at 12043 in .vmail 0x87fe0d4> nil nil nil]) nil nil]) vm-decode-mime-message() vm-show-current-message() vm-scroll-forward(nil) call-interactively(vm-scroll-forward)