M-x hm--html-minor-mode fails in 21.1.4, "i386-pc-win32"

Here's the backtrace. When I try loading hm--html-mode.el to get a better backtrace, that errs too. Regards, Adrian Signaling: (error "Invalid image-instantiator format" autodetect) check-valid-instantiator([autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"] image) canonicalize-spec-list([autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"] image) set-specifier(#<image-specifier global=<unspecified> fallback=((nil . ...)) 0x420c> [autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"] nil nil nil) set-glyph-property(#<glyph (pointer) #<image-specifier global=<unspecified> fallback=(...) 0x420c>0x420b> image [autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"] nil nil nil) set-glyph-image(#<glyph (pointer) #<image-specifier global=<unspecified> fallback=(...) 0x420c>0x420b> [autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"]) make-glyph([autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"] pointer) make-pointer-glyph([autodetect :data "c:\\Program Files\\XEmacs\\XEmacs-21.1.4\\etc\\idd\\drop"]) idd-make-drag-and-drop-pointer-glyph() <lines deleted by Adrian> command-execute(hm--html-minor-mode t) execute-extended-command(nil) call-interactively(execute-extended-command) -- Windows NT File Manager Help: To make sure that your files are secure, you should check their ownership regularly.