bug#12082: 24.1.50; Wrong character showed by "C-h c"

[Dani Moncayo]

> Looks like Windows lies to us about the input codepage.  Please apply
> the patches below, run Emacs in GUI mode under GDB, and do the
> following experiments:
>
>   . switch the keyboard to English ("EN" near the system tray), if you
>     can, and type a couple of pure ASCII characters

[a]
warning: w32fns: WM_CHAR 0x61
warning: w32term: 0x61 => 0x61 (cp1252)

[z]
warning: w32fns: WM_CHAR 0x7a
warning: w32term: 0x7a => 0x7a (cp1252)

>   . switch the keyboard to Spanish and type ç and M-ç

[ç]
warning: w32fns: WM_CHAR 0xe7
warning: w32term: 0xffffffe7 => 0xe7 (cp1252)

[M-ç]
warning: w32term: 0xffffff87 => 0x2021 (cp1252)

(yes, only one message for this character)

>   . do the latter both with active codepage 850 and 1252

?? Where can I set the "active codepage"? Please elaborate this step a bit more.

-- 
Dani Moncayo