From 171e0facc4131f74baec38f58fb0971c52ac2c8a Mon Sep 17 00:00:00 2001
From: =?utf8?q?=E8=8E=AF=E5=87=9B?=
 <34085039+mokurin000@users.noreply.github.com>
Date: Fri, 27 Feb 2026 18:06:46 +0800
Subject: [PATCH] gh-123853: Cleanup Windows 95 locale fallback support
 (#144738)

Closes #123853
---
 Lib/locale.py                                         |  4 ----
 .../2026-02-21-17-34-53.gh-issue-123853.6RUwWh.rst    |  1 +
 Modules/_localemodule.c                               | 11 -----------
 3 files changed, 1 insertion(+), 15 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2026-02-21-17-34-53.gh-issue-123853.6RUwWh.rst

diff --git a/Lib/locale.py b/Lib/locale.py
index dea3ee55cf4d..e7382796905e 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -570,10 +570,6 @@ def _getdefaultlocale(envvars=('LC_ALL', 'LC_CTYPE', 'LANG', 'LANGUAGE')):
     except (ImportError, AttributeError):
         pass
     else:
-        # make sure the code/encoding values are valid
-        if sys.platform == "win32" and code and code[:2] == "0x":
-            # map windows language identifier to language name
-            code = windows_locale.get(int(code, 0))
         # ...add other platform-specific processing here, if
         # necessary...
         return code, encoding
diff --git a/Misc/NEWS.d/next/Library/2026-02-21-17-34-53.gh-issue-123853.6RUwWh.rst b/Misc/NEWS.d/next/Library/2026-02-21-17-34-53.gh-issue-123853.6RUwWh.rst
new file mode 100644
index 000000000000..1babcbfd8e67
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-02-21-17-34-53.gh-issue-123853.6RUwWh.rst
@@ -0,0 +1 @@
+Removed Windows 95 compatibility for :func:`locale.getdefaultlocale`.
diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index f0a418ee5024..86a390e52a55 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -555,17 +555,6 @@ _locale__getdefaultlocale_impl(PyObject *module)
             return Py_BuildValue("ss", locale, encoding);
     }
 
-    /* If we end up here, this windows version didn't know about
-       ISO639/ISO3166 names (it's probably Windows 95).  Return the
-       Windows language identifier instead (a hexadecimal number) */
-
-    locale[0] = '0';
-    locale[1] = 'x';
-    if (GetLocaleInfoA(LOCALE_USER_DEFAULT, LOCALE_IDEFAULTLANGUAGE,
-                      locale+2, sizeof(locale)-2)) {
-        return Py_BuildValue("ss", locale, encoding);
-    }
-
     /* cannot determine the language code (very unlikely) */
     return Py_BuildValue("Os", Py_None, encoding);
 }
-- 
2.47.3