Warning when exiting shell on Windows

[martin rudalics]

This is with Emacs 25 on Windows XP.  With emacs -Q I type M-x shell and
in the shell buffer I immediately type exit.  This gets me the warning:


These default coding systems were tried to encode "c:/Program...":
  (iso-latin-1-dos (22006 . 8216) (22017 . 8217) (22021 . 8216) (22037
  . 8217) (22079 . 8216) (22097 . 8217))
However, each of them encountered characters it couldn’t encode:
  iso-latin-1-dos cannot encode these: ‘ ’ ‘ ’ ‘ ’


Since normally I use (set-language-environment "UTF-8") I never noticed
this before.  Do/should we, at least, warn about this somewhere?

martin