bug#5691: C-\ translates to \ on Windows Vista

[Deniz Dogan <deniz.a.m.dogan@gmail.com>]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs@gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I'm trying to hit C-\ on my Windows Vista machine, but Emacs recognizes
the key press as just \ (self-insert-command).

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
c:/Program Files/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.1.1 (i386-mingw-nt6.0.6002)
 of 2009-07-30 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 6.0.6002
configured using `configure --with-gcc (4.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: rcirc

Minor modes in effect:
  rcirc-track-minor-mode: t
  diff-auto-refine-mode: t
  global-auto-complete-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
<backspace> <backspace> <backspace> SPC o n SPC m y
SPC s w e d i s h SPC k e y b o a r d SPC i SPC h a
v e SPC t o SPC h i t SPC C <backspace> A l t G r +
+ <return> s o SPC t h i s SPC b e c o m e s SPC C -
A l t G r + <backspace> - 0 <backspace> + <return> b
u t SPC o n t l y SPC <C-backspace> o n l y SPC A l
t G r - + C-SPC C-a C-w C-t o C-t o \ <backspace>
C-t o C-t o C-t o k e <tab> C-y <return> <return>
C-t C-n C-t C-n C-t C-n C-t C-n C-t C-n C-c C-SPC
C-c C-SPC C-t C-n C-t C-n C-t C-n C-- C-l C-t C-n
C-t C-n C-t C-o C-t C-n C-t C-n C-t o C-t C-n C-t o
C-t o M-t r e p o r t - e m a c s - b u g <return>

Recent messages:
Making completion list...
Type C-t 4 C-o RET to restore the other window.
Making completion list...
Quit
C-h f runs the command describe-function
View mode: type C-h for help, C-h m for commands, M-x View-quit to quit.
Mark set [8 times]
C-t ` runs the command next-error
\ runs the command self-insert-command
Mark set [2 times]