gh-89545: Updates platform module to use new internal _wmi module on Windows to directly query OS properties (GH-96289)

17 files changed, 859 insertions, 91 deletions

diff --git a/Include/internal/pycore_global_strings.h b/Include/internal/pycore_global_strings.h
index 03f6b90..1523eef 100644
--- a/Include/internal/pycore_global_strings.h
+++ b/Include/internal/pycore_global_strings.h
@@ -527,6 +527,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(protocol)
         STRUCT_FOR_ID(ps1)
         STRUCT_FOR_ID(ps2)
+        STRUCT_FOR_ID(query)
         STRUCT_FOR_ID(quotetabs)
         STRUCT_FOR_ID(r)
         STRUCT_FOR_ID(raw)
diff --git a/Include/internal/pycore_runtime_init_generated.h b/Include/internal/pycore_runtime_init_generated.h
index 7a76077..32ff57b 100644
--- a/Include/internal/pycore_runtime_init_generated.h
+++ b/Include/internal/pycore_runtime_init_generated.h
@@ -1036,6 +1036,7 @@ extern "C" {
                 INIT_ID(protocol), \
                 INIT_ID(ps1), \
                 INIT_ID(ps2), \
+                INIT_ID(query), \
                 INIT_ID(quotetabs), \
                 INIT_ID(r), \
                 INIT_ID(raw), \
@@ -2377,6 +2378,8 @@ _PyUnicode_InitStaticStrings(void) {
     PyUnicode_InternInPlace(&string);
     string = &_Py_ID(ps2);
     PyUnicode_InternInPlace(&string);
+    string = &_Py_ID(query);
+    PyUnicode_InternInPlace(&string);
     string = &_Py_ID(quotetabs);
     PyUnicode_InternInPlace(&string);
     string = &_Py_ID(r);
@@ -6680,6 +6683,10 @@ _PyStaticObjects_CheckRefcnt(void) {
         _PyObject_Dump((PyObject *)&_Py_ID(ps2));
         Py_FatalError("immortal object has less refcnt than expected _PyObject_IMMORTAL_REFCNT");
     };
+    if (Py_REFCNT((PyObject *)&_Py_ID(query)) < _PyObject_IMMORTAL_REFCNT) {
+        _PyObject_Dump((PyObject *)&_Py_ID(query));
+        Py_FatalError("immortal object has less refcnt than expected _PyObject_IMMORTAL_REFCNT");
+    };
     if (Py_REFCNT((PyObject *)&_Py_ID(quotetabs)) < _PyObject_IMMORTAL_REFCNT) {
         _PyObject_Dump((PyObject *)&_Py_ID(quotetabs));
         Py_FatalError("immortal object has less refcnt than expected _PyObject_IMMORTAL_REFCNT");
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 959bcd0..d9582f4 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -732,9 +732,8 @@ else:
         return path
 
 
-# Win9x family and earlier have no Unicode filename support.
-supports_unicode_filenames = (hasattr(sys, "getwindowsversion") and
-                              sys.getwindowsversion()[3] >= 2)
+# All supported version have Unicode filename support.
+supports_unicode_filenames = True
 
 def relpath(path, start=None):
     """Return a relative version of a path"""
diff --git a/Lib/platform.py b/Lib/platform.py
index df8faac..9f5b317 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -309,34 +309,52 @@ def _syscmd_ver(system='', release='', version='',
         version = _norm_version(version)
     return system, release, version
 
-_WIN32_CLIENT_RELEASES = {
-    (5, 0): "2000",
-    (5, 1): "XP",
-    # Strictly, 5.2 client is XP 64-bit, but platform.py historically
-    # has always called it 2003 Server
-    (5, 2): "2003Server",
-    (5, None): "post2003",
-
-    (6, 0): "Vista",
-    (6, 1): "7",
-    (6, 2): "8",
-    (6, 3): "8.1",
-    (6, None): "post8.1",
-
-    (10, 0): "10",
-    (10, None): "post10",
-}
-
-# Server release name lookup will default to client names if necessary
-_WIN32_SERVER_RELEASES = {
-    (5, 2): "2003Server",
-
-    (6, 0): "2008Server",
-    (6, 1): "2008ServerR2",
-    (6, 2): "2012Server",
-    (6, 3): "2012ServerR2",
-    (6, None): "post2012ServerR2",
-}
+try:
+    import _wmi
+except ImportError:
+    def _wmi_query(*keys):
+        raise OSError("not supported")
+else:
+    def _wmi_query(table, *keys):
+        table = {
+            "OS": "Win32_OperatingSystem",
+            "CPU": "Win32_Processor",
+        }[table]
+        data = _wmi.exec_query("SELECT {} FROM {}".format(
+            ",".join(keys),
+            table,
+        )).split("\0")
+        split_data = (i.partition("=") for i in data)
+        dict_data = {i[0]: i[2] for i in split_data}
+        return (dict_data[k] for k in keys)
+
+
+_WIN32_CLIENT_RELEASES = [
+    ((10, 1, 0), "post11"),
+    ((10, 0, 22000), "11"),
+    ((6, 4, 0), "10"),
+    ((6, 3, 0), "8.1"),
+    ((6, 2, 0), "8"),
+    ((6, 1, 0), "7"),
+    ((6, 0, 0), "Vista"),
+    ((5, 2, 3790), "XP64"),
+    ((5, 2, 0), "XPMedia"),
+    ((5, 1, 0), "XP"),
+    ((5, 0, 0), "2000"),
+]
+
+_WIN32_SERVER_RELEASES = [
+    ((10, 1, 0), "post2022Server"),
+    ((10, 0, 20348), "2022Server"),
+    ((10, 0, 17763), "2019Server"),
+    ((6, 4, 0), "2016Server"),
+    ((6, 3, 0), "2012ServerR2"),
+    ((6, 2, 0), "2012Server"),
+    ((6, 1, 0), "2008ServerR2"),
+    ((6, 0, 0), "2008Server"),
+    ((5, 2, 0), "2003Server"),
+    ((5, 0, 0), "2000Server"),
+]
 
 def win32_is_iot():
     return win32_edition() in ('IoTUAP', 'NanoServer', 'WindowsCoreHeadless', 'IoTEdgeOS')
@@ -359,22 +377,40 @@ def win32_edition():
 
     return None
 
-def win32_ver(release='', version='', csd='', ptype=''):
+def _win32_ver(version, csd, ptype):
+    # Try using WMI first, as this is the canonical source of data
+    try:
+        (version, product_type, ptype, spmajor, spminor)  = _wmi_query(
+            'OS',
+            'Version',
+            'ProductType',
+            'BuildType',
+            'ServicePackMajorVersion',
+            'ServicePackMinorVersion',
+        )
+        is_client = (int(product_type) == 1)
+        if spminor and spminor != '0':
+            csd = f'SP{spmajor}.{spminor}'
+        else:
+            csd = f'SP{spmajor}'
+        return version, csd, ptype, is_client
+    except OSError:
+        pass
+
+    # Fall back to a combination of sys.getwindowsversion and "ver"
     try:
         from sys import getwindowsversion
     except ImportError:
-        return release, version, csd, ptype
+        return version, csd, ptype, True
 
     winver = getwindowsversion()
+    is_client = (getattr(winver, 'product_type', 1) == 1)
     try:
-        major, minor, build = map(int, _syscmd_ver()[2].split('.'))
+        version = _syscmd_ver()[2]
+        major, minor, build = map(int, version.split('.'))
     except ValueError:
         major, minor, build = winver.platform_version or winver[:3]
-    version = '{0}.{1}.{2}'.format(major, minor, build)
-
-    release = (_WIN32_CLIENT_RELEASES.get((major, minor)) or
-               _WIN32_CLIENT_RELEASES.get((major, None)) or
-               release)
+        version = '{0}.{1}.{2}'.format(major, minor, build)
 
     # getwindowsversion() reflect the compatibility mode Python is
     # running under, and so the service pack value is only going to be
@@ -386,12 +422,6 @@ def win32_ver(release='', version='', csd='', ptype=''):
             if csd[:13] == 'Service Pack ':
                 csd = 'SP' + csd[13:]
 
-    # VER_NT_SERVER = 3
-    if getattr(winver, 'product_type', None) == 3:
-        release = (_WIN32_SERVER_RELEASES.get((major, minor)) or
-                   _WIN32_SERVER_RELEASES.get((major, None)) or
-                   release)
-
     try:
         try:
             import winreg
@@ -407,6 +437,18 @@ def win32_ver(release='', version='', csd='', ptype=''):
         except OSError:
             pass
 
+    return version, csd, ptype, is_client
+
+def win32_ver(release='', version='', csd='', ptype=''):
+    is_client = False
+
+    version, csd, ptype, is_client = _win32_ver(version, csd, ptype)
+
+    if version:
+        intversion = tuple(map(int, version.split('.')))
+        releases = _WIN32_CLIENT_RELEASES if is_client else _WIN32_SERVER_RELEASES
+        release = next((r for v, r in releases if v <= intversion), release)
+
     return release, version, csd, ptype
 
 
@@ -725,6 +767,21 @@ def _get_machine_win32():
     # http://www.geocities.com/rick_lively/MANUALS/ENV/MSWIN/PROCESSI.HTM
 
     # WOW64 processes mask the native architecture
+    try:
+        [arch, *_] = _wmi_query('CPU', 'Architecture')
+    except OSError:
+        pass
+    else:
+        try:
+            arch = ['x86', 'MIPS', 'Alpha', 'PowerPC', None,
+                    'ARM', 'ia64', None, None,
+                    'AMD64', None, None, 'ARM64',
+            ][int(arch)]
+        except (ValueError, IndexError):
+            pass
+        else:
+            if arch:
+                return arch
     return (
         os.environ.get('PROCESSOR_ARCHITEW6432', '') or
         os.environ.get('PROCESSOR_ARCHITECTURE', '')
@@ -738,7 +795,12 @@ class _Processor:
         return func() or ''
 
     def get_win32():
-        return os.environ.get('PROCESSOR_IDENTIFIER', _get_machine_win32())
+        try:
+            manufacturer, caption = _wmi_query('CPU', 'Manufacturer', 'Caption')
+        except OSError:
+            return os.environ.get('PROCESSOR_IDENTIFIER', _get_machine_win32())
+        else:
+            return f'{caption}, {manufacturer}'
 
     def get_OpenVMS():
         try:
diff --git a/Lib/test/audit-tests.py b/Lib/test/audit-tests.py
index 00333cc..66c08f7 100644
--- a/Lib/test/audit-tests.py
+++ b/Lib/test/audit-tests.py
@@ -419,6 +419,17 @@ def test_sys_getframe():
     sys._getframe()
 
 
+def test_wmi_exec_query():
+    import _wmi
+
+    def hook(event, args):
+        if event.startswith("_wmi."):
+            print(event, args[0])
+
+    sys.addaudithook(hook)
+    _wmi.exec_query("SELECT * FROM Win32_OperatingSystem")
+
+
 if __name__ == "__main__":
     from test.support import suppress_msvcrt_asserts
 
diff --git a/Lib/test/test_audit.py b/Lib/test/test_audit.py
index 18426f2..09b3333 100644
--- a/Lib/test/test_audit.py
+++ b/Lib/test/test_audit.py
@@ -185,5 +185,20 @@ class AuditTest(unittest.TestCase):
 
         self.assertEqual(actual, expected)
 
+
+    def test_wmi_exec_query(self):
+        import_helper.import_module("_wmi")
+        returncode, events, stderr = self.run_python("test_wmi_exec_query")
+        if returncode:
+            self.fail(stderr)
+
+        if support.verbose:
+            print(*events, sep='\n')
+        actual = [(ev[0], ev[2]) for ev in events]
+        expected = [("_wmi.exec_query", "SELECT * FROM Win32_OperatingSystem")]
+
+        self.assertEqual(actual, expected)
+
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/Lib/test/test_platform.py b/Lib/test/test_platform.py
index 9b2cd20..9c03a89 100644
--- a/Lib/test/test_platform.py
+++ b/Lib/test/test_platform.py
@@ -229,6 +229,14 @@ class PlatformTest(unittest.TestCase):
         self.assertEqual(res[-1], res.processor)
         self.assertEqual(len(res), 6)
 
+    @unittest.skipUnless(sys.platform.startswith('win'), "windows only test")
+    def test_uname_win32_without_wmi(self):
+        def raises_oserror(*a):
+            raise OSError()
+
+        with support.swap_attr(platform, '_wmi_query', raises_oserror):
+            self.test_uname()
+
     def test_uname_cast_to_tuple(self):
         res = platform.uname()
         expected = (
@@ -289,20 +297,27 @@ class PlatformTest(unittest.TestCase):
         # on 64 bit Windows: if PROCESSOR_ARCHITEW6432 exists we should be
         # using it, per
         # http://blogs.msdn.com/david.wang/archive/2006/03/26/HOWTO-Detect-Process-Bitness.aspx
-        try:
+
+        # We also need to suppress WMI checks, as those are reliable and
+        # overrule the environment variables
+        def raises_oserror(*a):
+            raise OSError()
+
+        with support.swap_attr(platform, '_wmi_query', raises_oserror):
             with os_helper.EnvironmentVarGuard() as environ:
-                if 'PROCESSOR_ARCHITEW6432' in environ:
-                    del environ['PROCESSOR_ARCHITEW6432']
-                environ['PROCESSOR_ARCHITECTURE'] = 'foo'
-                platform._uname_cache = None
-                system, node, release, version, machine, processor = platform.uname()
-                self.assertEqual(machine, 'foo')
-                environ['PROCESSOR_ARCHITEW6432'] = 'bar'
-                platform._uname_cache = None
-                system, node, release, version, machine, processor = platform.uname()
-                self.assertEqual(machine, 'bar')
-        finally:
-            platform._uname_cache = None
+                try:
+                    if 'PROCESSOR_ARCHITEW6432' in environ:
+                        del environ['PROCESSOR_ARCHITEW6432']
+                    environ['PROCESSOR_ARCHITECTURE'] = 'foo'
+                    platform._uname_cache = None
+                    system, node, release, version, machine, processor = platform.uname()
+                    self.assertEqual(machine, 'foo')
+                    environ['PROCESSOR_ARCHITEW6432'] = 'bar'
+                    platform._uname_cache = None
+                    system, node, release, version, machine, processor = platform.uname()
+                    self.assertEqual(machine, 'bar')
+                finally:
+                    platform._uname_cache = None
 
     def test_java_ver(self):
         res = platform.java_ver()
diff --git a/Lib/test/test_wmi.py b/Lib/test/test_wmi.py
new file mode 100644
index 0000000..af2a453
--- /dev/null
+++ b/Lib/test/test_wmi.py
@@ -0,0 +1,67 @@
+# Test the internal _wmi module on Windows
+# This is used by the platform module, and potentially others
+
+import re
+import sys
+import unittest
+from test.support import import_helper
+
+
+# Do this first so test will be skipped if module doesn't exist
+_wmi = import_helper.import_module('_wmi', required_on=['win'])
+
+
+class WmiTests(unittest.TestCase):
+    def test_wmi_query_os_version(self):
+        r = _wmi.exec_query("SELECT Version FROM Win32_OperatingSystem").split("\0")
+        self.assertEqual(1, len(r))
+        k, eq, v = r[0].partition("=")
+        self.assertEqual("=", eq, r[0])
+        self.assertEqual("Version", k, r[0])
+        # Best we can check for the version is that it's digits, dot, digits, anything
+        # Otherwise, we are likely checking the result of the query against itself
+        self.assertTrue(re.match(r"\d+\.\d+.+$", v), r[0])
+
+    def test_wmi_query_repeated(self):
+        # Repeated queries should not break
+        for _ in range(10):
+            self.test_wmi_query_os_version()
+
+    def test_wmi_query_error(self):
+        # Invalid queries fail with OSError
+        try:
+            _wmi.exec_query("SELECT InvalidColumnName FROM InvalidTableName")
+        except OSError as ex:
+            if ex.winerror & 0xFFFFFFFF == 0x80041010:
+                # This is the expected error code. All others should fail the test
+                return
+        self.fail("Expected OSError")
+
+    def test_wmi_query_repeated_error(self):
+        for _ in range(10):
+            self.test_wmi_query_error()
+
+    def test_wmi_query_not_select(self):
+        # Queries other than SELECT are blocked to avoid potential exploits
+        with self.assertRaises(ValueError):
+            _wmi.exec_query("not select, just in case someone tries something")
+
+    def test_wmi_query_overflow(self):
+        # Ensure very big queries fail
+        # Test multiple times to ensure consistency
+        for _ in range(2):
+            with self.assertRaises(OSError):
+                _wmi.exec_query("SELECT * FROM CIM_DataFile")
+
+    def test_wmi_query_multiple_rows(self):
+        # Multiple instances should have an extra null separator
+        r = _wmi.exec_query("SELECT ProcessId FROM Win32_Process WHERE ProcessId < 1000")
+        self.assertFalse(r.startswith("\0"), r)
+        self.assertFalse(r.endswith("\0"), r)
+        it = iter(r.split("\0"))
+        try:
+            while True:
+                self.assertTrue(re.match(r"ProcessId=\d+", next(it)))
+                self.assertEqual("", next(it))
+        except StopIteration:
+            pass
diff --git a/Misc/NEWS.d/next/Windows/2022-08-26-00-11-18.gh-issue-89545.zmJMY_.rst b/Misc/NEWS.d/next/Windows/2022-08-26-00-11-18.gh-issue-89545.zmJMY_.rst
new file mode 100644
index 0000000..eeedbf9
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2022-08-26-00-11-18.gh-issue-89545.zmJMY_.rst
@@ -0,0 +1 @@
+Updates :mod:`platform` code getting the Windows version to use native Windows Management Instrumentation (WMI) queries to determine OS version, type, and architecture.
diff --git a/PC/_wmimodule.cpp b/PC/_wmimodule.cpp
new file mode 100644
index 0000000..a9f7836
--- /dev/null
+++ b/PC/_wmimodule.cpp
@@ -0,0 +1,307 @@
+//
+// Helper library for querying WMI using its COM-based query API.
+//
+// Copyright (c) Microsoft Corporation
+// Licensed to PSF under a contributor agreement
+//
+
+// Version history
+//  2022-08: Initial contribution (Steve Dower)
+
+#define _WIN32_DCOM
+#include <Windows.h>
+#include <comdef.h>
+#include <Wbemidl.h>
+#include <propvarutil.h>
+
+#include <Python.h>
+#include "clinic/_wmimodule.cpp.h"
+
+
+/*[clinic input]
+module _wmi
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=7ca95dad1453d10d]*/
+
+
+
+struct _query_data {
+    LPCWSTR query;
+    HANDLE writePipe;
+    HANDLE readPipe;
+};
+
+
+static DWORD WINAPI
+_query_thread(LPVOID param)
+{
+    IWbemLocator *locator = NULL;
+    IWbemServices *services = NULL;
+    IEnumWbemClassObject* enumerator = NULL;
+    BSTR bstrQuery = NULL;
+    struct _query_data *data = (struct _query_data*)param;
+
+    HRESULT hr = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
+    if (FAILED(hr)) {
+        CloseHandle(data->writePipe);
+        return (DWORD)hr;
+    }
+
+    hr = CoInitializeSecurity(
+        NULL, -1, NULL, NULL,
+        RPC_C_AUTHN_LEVEL_DEFAULT,
+        RPC_C_IMP_LEVEL_IMPERSONATE,
+        NULL, EOAC_NONE, NULL
+    );
+    if (SUCCEEDED(hr)) {
+        hr = CoCreateInstance(
+            CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER,
+            IID_IWbemLocator, (LPVOID *)&locator
+        );
+    }
+    if (SUCCEEDED(hr)) {
+        hr = locator->ConnectServer(
+            bstr_t(L"ROOT\\CIMV2"),
+            NULL, NULL, 0, NULL, 0, 0, &services
+        );
+    }
+    if (SUCCEEDED(hr)) {
+        hr = CoSetProxyBlanket(
+            services, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, NULL,
+            RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE,
+            NULL, EOAC_NONE
+        );
+    }
+    if (SUCCEEDED(hr)) {
+        bstrQuery = SysAllocString(data->query);
+        if (!bstrQuery) {
+            hr = HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY);
+        }
+    }
+    if (SUCCEEDED(hr)) {
+        hr = services->ExecQuery(
+            bstr_t("WQL"), 
+            bstrQuery,
+            WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
+            NULL,
+            &enumerator
+        );
+    }
+
+    // Okay, after all that, at this stage we should have an enumerator
+    // to the query results and can start writing them to the pipe!
+    IWbemClassObject *value = NULL;
+    int startOfEnum = TRUE;
+    int endOfEnum = FALSE;
+    while (SUCCEEDED(hr) && !endOfEnum) {
+        ULONG got = 0;
+        DWORD written;
+        hr = enumerator->Next(WBEM_INFINITE, 1, &value, &got);
+        if (hr == WBEM_S_FALSE) {
+            // Could be at the end, but still got a result this time
+            endOfEnum = TRUE;
+            hr = 0;
+            break;
+        }
+        if (FAILED(hr) || got != 1 || !value) {
+            continue;
+        }
+        if (!startOfEnum && !WriteFile(data->writePipe, (LPVOID)L"\0", 2, &written, NULL)) {
+            hr = HRESULT_FROM_WIN32(GetLastError());
+            break;
+        }
+        startOfEnum = FALSE;
+        // Okay, now we have each resulting object it's time to
+        // enumerate its members
+        hr = value->BeginEnumeration(0);
+        if (FAILED(hr)) {
+            value->Release();
+            break;
+        }
+        while (SUCCEEDED(hr)) {
+            BSTR propName;
+            VARIANT propValue;
+            long flavor;
+            hr = value->Next(0, &propName, &propValue, NULL, &flavor);
+            if (hr == WBEM_S_NO_MORE_DATA) {
+                hr = 0;
+                break;
+            }
+            if (SUCCEEDED(hr) && (flavor & WBEM_FLAVOR_MASK_ORIGIN) != WBEM_FLAVOR_ORIGIN_SYSTEM) {
+                WCHAR propStr[8192];
+                hr = VariantToString(propValue, propStr, sizeof(propStr) / sizeof(propStr[0]));
+                if (SUCCEEDED(hr)) {
+                    DWORD cbStr1, cbStr2;
+                    cbStr1 = (DWORD)(wcslen(propName) * sizeof(propName[0]));
+                    cbStr2 = (DWORD)(wcslen(propStr) * sizeof(propStr[0]));
+                    if (!WriteFile(data->writePipe, propName, cbStr1, &written, NULL) ||
+                        !WriteFile(data->writePipe, (LPVOID)L"=", 2, &written, NULL) ||
+                        !WriteFile(data->writePipe, propStr, cbStr2, &written, NULL) ||
+                        !WriteFile(data->writePipe, (LPVOID)L"\0", 2, &written, NULL)
+                    ) {
+                        hr = HRESULT_FROM_WIN32(GetLastError());
+                    }
+                }
+                VariantClear(&propValue);
+                SysFreeString(propName);
+            }
+        }
+        value->EndEnumeration();
+        value->Release();
+    }
+
+    if (bstrQuery) {
+        SysFreeString(bstrQuery);
+    }
+    if (enumerator) {
+        enumerator->Release();
+    }
+    if (services) {
+        services->Release();
+    }
+    if (locator) {
+        locator->Release();
+    }
+    CoUninitialize();
+    CloseHandle(data->writePipe);
+    return (DWORD)hr;
+}
+
+
+/*[clinic input]
+_wmi.exec_query
+
+    query: unicode
+
+Runs a WMI query against the local machine.
+
+This returns a single string with 'name=value' pairs in a flat array separated
+by null characters.
+[clinic start generated code]*/
+
+static PyObject *
+_wmi_exec_query_impl(PyObject *module, PyObject *query)
+/*[clinic end generated code: output=a62303d5bb5e003f input=48d2d0a1e1a7e3c2]*/
+
+/*[clinic end generated code]*/
+{
+    PyObject *result = NULL;
+    HANDLE hThread = NULL;
+    int err = 0;
+    WCHAR buffer[8192];
+    DWORD offset = 0;
+    DWORD bytesRead;
+    struct _query_data data = {0};
+
+    if (PySys_Audit("_wmi.exec_query", "O", query) < 0) {
+        return NULL;
+    }
+
+    data.query = PyUnicode_AsWideCharString(query, NULL);
+    if (!data.query) {
+        return NULL;
+    }
+
+    if (0 != _wcsnicmp(data.query, L"select ", 7)) {
+        PyMem_Free((void *)data.query);
+        PyErr_SetString(PyExc_ValueError, "only SELECT queries are supported");
+        return NULL;
+    }
+
+    Py_BEGIN_ALLOW_THREADS
+
+    if (!CreatePipe(&data.readPipe, &data.writePipe, NULL, 0)) {
+        err = GetLastError();
+    } else {
+        hThread = CreateThread(NULL, 0, _query_thread, (LPVOID*)&data, 0, NULL);
+        if (!hThread) {
+            err = GetLastError();
+            // Normally the thread proc closes this handle, but since we never started
+            // we need to close it here.
+            CloseHandle(data.writePipe);
+        }
+    }
+
+    while (!err) {
+        if (ReadFile(
+            data.readPipe,
+            (LPVOID)&buffer[offset / sizeof(buffer[0])],
+            sizeof(buffer) - offset,
+            &bytesRead,
+            NULL
+        )) {
+            offset += bytesRead;
+            if (offset >= sizeof(buffer)) {
+                err = ERROR_MORE_DATA;
+            }
+        } else {
+            err = GetLastError();
+        }
+    }
+
+    if (data.readPipe) {
+        CloseHandle(data.readPipe);
+    }
+
+    // Allow the thread some time to clean up
+    switch (WaitForSingleObject(hThread, 1000)) {
+    case WAIT_OBJECT_0:
+        // Thread ended cleanly
+        if (!GetExitCodeThread(hThread, (LPDWORD)&err)) {
+            err = GetLastError();
+        }
+        break;
+    case WAIT_TIMEOUT:
+        // Probably stuck - there's not much we can do, unfortunately
+        if (err == 0 || err == ERROR_BROKEN_PIPE) {
+            err = WAIT_TIMEOUT;
+        }
+        break;
+    default:
+        if (err == 0 || err == ERROR_BROKEN_PIPE) {
+            err = GetLastError();
+        }
+        break;
+    }
+
+    CloseHandle(hThread);
+    hThread = NULL;
+
+    Py_END_ALLOW_THREADS
+
+    PyMem_Free((void *)data.query);
+
+    if (err == ERROR_MORE_DATA) {
+        PyErr_Format(PyExc_OSError, "Query returns more than %zd characters", Py_ARRAY_LENGTH(buffer));
+        return NULL;
+    } else if (err) {
+        PyErr_SetFromWindowsErr(err);
+        return NULL;
+    }
+
+    if (!offset) {
+        return PyUnicode_FromStringAndSize(NULL, 0);
+    }
+    return PyUnicode_FromWideChar(buffer, offset  / sizeof(buffer[0]) - 1);
+}
+
+
+static PyMethodDef wmi_functions[] = {
+    _WMI_EXEC_QUERY_METHODDEF
+    { NULL, NULL, 0, NULL }
+};
+
+static PyModuleDef wmi_def = {
+    PyModuleDef_HEAD_INIT,
+    "_wmi",
+    NULL,   // doc
+    0,      // m_size
+    wmi_functions
+};
+
+extern "C" {
+    PyMODINIT_FUNC PyInit__wmi(void)
+    {
+        return PyModuleDef_Init(&wmi_def);
+    }
+}
diff --git a/PC/clinic/_wmimodule.cpp.h b/PC/clinic/_wmimodule.cpp.h
new file mode 100644
index 0000000..e2b947f
--- /dev/null
+++ b/PC/clinic/_wmimodule.cpp.h
@@ -0,0 +1,75 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+#  include "pycore_gc.h"            // PyGC_Head
+#  include "pycore_runtime.h"       // _Py_ID()
+#endif
+
+
+PyDoc_STRVAR(_wmi_exec_query__doc__,
+"exec_query($module, /, query)\n"
+"--\n"
+"\n"
+"Runs a WMI query against the local machine.\n"
+"\n"
+"This returns a single string with \'name=value\' pairs in a flat array separated\n"
+"by null characters.");
+
+#define _WMI_EXEC_QUERY_METHODDEF    \
+    {"exec_query", _PyCFunction_CAST(_wmi_exec_query), METH_FASTCALL|METH_KEYWORDS, _wmi_exec_query__doc__},
+
+static PyObject *
+_wmi_exec_query_impl(PyObject *module, PyObject *query);
+
+static PyObject *
+_wmi_exec_query(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 1
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(query), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"query", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "exec_query",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    PyObject *query;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 1, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    if (!PyUnicode_Check(args[0])) {
+        _PyArg_BadArgument("exec_query", "argument 'query'", "str", args[0]);
+        goto exit;
+    }
+    if (PyUnicode_READY(args[0]) == -1) {
+        goto exit;
+    }
+    query = args[0];
+    return_value = _wmi_exec_query_impl(module, query);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=7fdf0c0579ddb566 input=a9049054013a1b77]*/
diff --git a/PCbuild/_wmi.vcxproj b/PCbuild/_wmi.vcxproj
new file mode 100644
index 0000000..c1914a3
--- /dev/null
+++ b/PCbuild/_wmi.vcxproj
@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|ARM">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGInstrument|ARM">
+      <Configuration>PGInstrument</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGInstrument|ARM64">
+      <Configuration>PGInstrument</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGInstrument|Win32">
+      <Configuration>PGInstrument</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGInstrument|x64">
+      <Configuration>PGInstrument</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGUpdate|ARM">
+      <Configuration>PGUpdate</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGUpdate|ARM64">
+      <Configuration>PGUpdate</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGUpdate|Win32">
+      <Configuration>PGUpdate</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="PGUpdate|x64">
+      <Configuration>PGUpdate</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM">
+      <Configuration>Release</Configuration>
+      <Platform>ARM</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{54B1431F-B86B-4ACB-B28C-88BCF93191D8}</ProjectGuid>
+    <RootNamespace>_wmi</RootNamespace>
+    <Keyword>Win32Proj</Keyword>
+    <SupportPGO>false</SupportPGO>
+  </PropertyGroup>
+  <Import Project="python.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <CharacterSet>NotSet</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <TargetExt>.pyd</TargetExt>
+  </PropertyGroup>
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="pyproject.props" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <_ProjectFileVersion>10.0.30319.1</_ProjectFileVersion>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalOptions>/std:c++20 %(AdditionalOptions)</AdditionalOptions>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>wbemuuid.lib;propsys.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <DelayLoadDLLs>ole32.dll</DelayLoadDLLs>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\PC\_wmimodule.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="..\PC\python_nt.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="pythoncore.vcxproj">
+      <Project>{cf7ac3d1-e2df-41d2-bea6-1e2556cdea26}</Project>
+      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/PCbuild/_wmi.vcxproj.filters b/PCbuild/_wmi.vcxproj.filters
new file mode 100644
index 0000000..fa80462
--- /dev/null
+++ b/PCbuild/_wmi.vcxproj.filters
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{4fa4dbfa-e069-4ab4-86a6-ad389b2ec407}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\PC\_wmimodule.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="..\PC\python_nt.rc">
+      <Filter>Resource Files</Filter>
+    </ResourceCompile>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/PCbuild/pcbuild.proj b/PCbuild/pcbuild.proj
index 2ba0627..8d143a4 100644
--- a/PCbuild/pcbuild.proj
+++ b/PCbuild/pcbuild.proj
@@ -64,7 +64,7 @@
     <!-- pyshellext.dll -->
     <Projects Include="pyshellext.vcxproj" />
     <!-- Extension modules -->
-    <ExtensionModules Include="_asyncio;_zoneinfo;_decimal;_elementtree;_msi;_multiprocessing;_overlapped;pyexpat;_queue;select;unicodedata;winsound;_uuid" />
+    <ExtensionModules Include="_asyncio;_zoneinfo;_decimal;_elementtree;_msi;_multiprocessing;_overlapped;pyexpat;_queue;select;unicodedata;winsound;_uuid;_wmi" />
     <ExtensionModules Include="_ctypes" Condition="$(IncludeCTypes)" />
     <!-- Extension modules that require external sources -->
     <ExternalModules Include="_bz2;_lzma;_sqlite3" />
diff --git a/PCbuild/pcbuild.sln b/PCbuild/pcbuild.sln
index 3629a85..9f374ab 100644
--- a/PCbuild/pcbuild.sln
+++ b/PCbuild/pcbuild.sln
@@ -108,6 +108,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pythonw_uwp", "pythonw_uwp.
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "_uuid", "_uuid.vcxproj", "{CB435430-EBB1-478B-8F4E-C256F6838F55}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "_wmi", "_wmi.vcxproj", "{54B1431F-B86B-4ACB-B28C-88BCF93191D8}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM = Debug|ARM
@@ -1503,6 +1505,38 @@ Global
 		{CB435430-EBB1-478B-8F4E-C256F6838F55}.Release|Win32.Build.0 = Release|Win32
 		{CB435430-EBB1-478B-8F4E-C256F6838F55}.Release|x64.ActiveCfg = Release|x64
 		{CB435430-EBB1-478B-8F4E-C256F6838F55}.Release|x64.Build.0 = Release|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|ARM.ActiveCfg = Debug|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|ARM.Build.0 = Debug|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|ARM64.ActiveCfg = Debug|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|ARM64.Build.0 = Debug|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|Win32.ActiveCfg = Debug|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|Win32.Build.0 = Debug|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|x64.ActiveCfg = Debug|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Debug|x64.Build.0 = Debug|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|ARM.ActiveCfg = PGInstrument|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|ARM.Build.0 = PGInstrument|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|ARM64.ActiveCfg = PGInstrument|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|ARM64.Build.0 = PGInstrument|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|Win32.ActiveCfg = PGInstrument|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|Win32.Build.0 = PGInstrument|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|x64.ActiveCfg = PGInstrument|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGInstrument|x64.Build.0 = PGInstrument|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|ARM.ActiveCfg = PGUpdate|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|ARM.Build.0 = PGUpdate|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|ARM64.ActiveCfg = PGUpdate|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|ARM64.Build.0 = PGUpdate|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|Win32.ActiveCfg = PGUpdate|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|Win32.Build.0 = PGUpdate|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|x64.ActiveCfg = PGUpdate|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.PGUpdate|x64.Build.0 = PGUpdate|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|ARM.ActiveCfg = Release|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|ARM.Build.0 = Release|ARM
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|ARM64.ActiveCfg = Release|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|ARM64.Build.0 = Release|ARM64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|Win32.ActiveCfg = Release|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|Win32.Build.0 = Release|Win32
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|x64.ActiveCfg = Release|x64
+		{54B1431F-B86B-4ACB-B28C-88BCF93191D8}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index a33abb2..653b5a5 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1487,6 +1487,44 @@ static PyStructSequence_Desc windows_version_desc = {
                                       via indexing, the rest are name only */
 };
 
+static PyObject *
+_sys_getwindowsversion_from_kernel32()
+{
+    HANDLE hKernel32;
+    wchar_t kernel32_path[MAX_PATH];
+    LPVOID verblock;
+    DWORD verblock_size;
+    VS_FIXEDFILEINFO *ffi;
+    UINT ffi_len;
+    DWORD realMajor, realMinor, realBuild;
+
+    Py_BEGIN_ALLOW_THREADS
+    hKernel32 = GetModuleHandleW(L"kernel32.dll");
+    Py_END_ALLOW_THREADS
+    if (!hKernel32 || !GetModuleFileNameW(hKernel32, kernel32_path, MAX_PATH)) {
+        PyErr_SetFromWindowsErr(0);
+        return NULL;
+    }
+    verblock_size = GetFileVersionInfoSizeW(kernel32_path, NULL);
+    if (!verblock_size) {
+        PyErr_SetFromWindowsErr(0);
+        return NULL;
+    }
+    verblock = PyMem_RawMalloc(verblock_size);
+    if (!verblock ||
+        !GetFileVersionInfoW(kernel32_path, 0, verblock_size, verblock) ||
+        !VerQueryValueW(verblock, L"", (LPVOID)&ffi, &ffi_len)) {
+        PyErr_SetFromWindowsErr(0);
+        return NULL;
+    }
+
+    realMajor = HIWORD(ffi->dwProductVersionMS);
+    realMinor = LOWORD(ffi->dwProductVersionMS);
+    realBuild = HIWORD(ffi->dwProductVersionLS);
+    PyMem_RawFree(verblock);
+    return Py_BuildValue("(kkk)", realMajor, realMinor, realBuild);
+}
+
 /* Disable deprecation warnings about GetVersionEx as the result is
    being passed straight through to the caller, who is responsible for
    using it correctly. */
@@ -1516,11 +1554,13 @@ sys_getwindowsversion_impl(PyObject *module)
     PyObject *version;
     int pos = 0;
     OSVERSIONINFOEXW ver;
-    DWORD realMajor, realMinor, realBuild;
-    HANDLE hKernel32;
-    wchar_t kernel32_path[MAX_PATH];
-    LPVOID verblock;
-    DWORD verblock_size;
+
+    version = PyObject_GetAttrString(module, "_cached_windows_version");
+    if (version && PyObject_TypeCheck(version, &WindowsVersionType)) {
+        return version;
+    }
+    Py_XDECREF(version);
+    PyErr_Clear();
 
     ver.dwOSVersionInfoSize = sizeof(ver);
     if (!GetVersionExW((OSVERSIONINFOW*) &ver))
@@ -1540,41 +1580,34 @@ sys_getwindowsversion_impl(PyObject *module)
     PyStructSequence_SET_ITEM(version, pos++, PyLong_FromLong(ver.wSuiteMask));
     PyStructSequence_SET_ITEM(version, pos++, PyLong_FromLong(ver.wProductType));
 
-    realMajor = ver.dwMajorVersion;
-    realMinor = ver.dwMinorVersion;
-    realBuild = ver.dwBuildNumber;
-
     // GetVersion will lie if we are running in a compatibility mode.
     // We need to read the version info from a system file resource
     // to accurately identify the OS version. If we fail for any reason,
     // just return whatever GetVersion said.
-    Py_BEGIN_ALLOW_THREADS
-    hKernel32 = GetModuleHandleW(L"kernel32.dll");
-    Py_END_ALLOW_THREADS
-    if (hKernel32 && GetModuleFileNameW(hKernel32, kernel32_path, MAX_PATH) &&
-        (verblock_size = GetFileVersionInfoSizeW(kernel32_path, NULL)) &&
-        (verblock = PyMem_RawMalloc(verblock_size))) {
-        VS_FIXEDFILEINFO *ffi;
-        UINT ffi_len;
-
-        if (GetFileVersionInfoW(kernel32_path, 0, verblock_size, verblock) &&
-            VerQueryValueW(verblock, L"", (LPVOID)&ffi, &ffi_len)) {
-            realMajor = HIWORD(ffi->dwProductVersionMS);
-            realMinor = LOWORD(ffi->dwProductVersionMS);
-            realBuild = HIWORD(ffi->dwProductVersionLS);
-        }
-        PyMem_RawFree(verblock);
+    PyObject *realVersion = _sys_getwindowsversion_from_kernel32();
+    if (!realVersion) {
+        PyErr_Clear();
+        realVersion = Py_BuildValue("(kkk)",
+            ver.dwMajorVersion,
+            ver.dwMinorVersion,
+            ver.dwBuildNumber
+        );
+    }
+
+    if (realVersion) {
+        PyStructSequence_SET_ITEM(version, pos++, realVersion);
     }
-    PyStructSequence_SET_ITEM(version, pos++, Py_BuildValue("(kkk)",
-        realMajor,
-        realMinor,
-        realBuild
-    ));
 
     if (PyErr_Occurred()) {
         Py_DECREF(version);
         return NULL;
     }
+
+    if (PyObject_SetAttrString(module, "_cached_windows_version", version) < 0) {
+        Py_DECREF(version);
+        return NULL;
+    }
+
     return version;
 }
 
diff --git a/Tools/msi/lib/lib_files.wxs b/Tools/msi/lib/lib_files.wxs
index 64c046e..73c0231 100644
--- a/Tools/msi/lib/lib_files.wxs
+++ b/Tools/msi/lib/lib_files.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
-    <?define exts=pyexpat;select;unicodedata;winsound;_bz2;_elementtree;_socket;_ssl;_msi;_ctypes;_hashlib;_multiprocessing;_lzma;_decimal;_overlapped;_sqlite3;_asyncio;_queue;_uuid;_zoneinfo ?>
+    <?define exts=pyexpat;select;unicodedata;winsound;_bz2;_elementtree;_socket;_ssl;_msi;_ctypes;_hashlib;_multiprocessing;_lzma;_decimal;_overlapped;_sqlite3;_asyncio;_queue;_uuid;_wmi;_zoneinfo ?>
     <Fragment>
         <DirectoryRef Id="Lib_venv_scripts_nt" />