gh-152433: Windows: do not use _syscmd_ver() on UWP build

Lib/platform.py

@@ -422,16 +422,21 @@ def _win32_ver(version, csd, ptype):
     # Fall back to a combination of sys.getwindowsversion and "ver"
     try:
         from sys import getwindowsversion
+        from _winapi import IsWindowsDesktop
     except ImportError:
         return version, csd, ptype, True
 
     winver = getwindowsversion()
     is_client = (getattr(winver, 'product_type', 1) == 1)
-    try:
-        version = _syscmd_ver()[2]
-        major, minor, build = map(int, version.split('.'))
-    except ValueError:
-        major, minor, build = winver.platform_version or winver[:3]
+    if IsWindowsDesktop():
+        try:
+            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)
+    else:
+        major, minor, build = winver[:3]
         version = '{0}.{1}.{2}'.format(major, minor, build)
 
     # getwindowsversion() reflect the compatibility mode Python is

Modules/_winapi.c

@@ -3175,6 +3175,23 @@ _winapi_GetTickCount64_impl(PyObject *module)
     return PyLong_FromUnsignedLongLong(ticks);
 }
 
+/*[clinic input]
+_winapi.IsWindowsDesktop
+
+Return TRUE for Windows desktop build or FALSE for UWP build.
+[clinic start generated code]*/
+
+static PyObject *
+_winapi_IsWindowsDesktop_impl(PyObject *module)
+/*[clinic end generated code: output=6c1a044078bba5fd input=cf5bd7f013ba4bff]*/
+{
+#ifdef MS_WINDOWS_DESKTOP
+    return PyBool_FromLong(TRUE);
+#else
+    return PyBool_FromLong(FALSE);
+#endif
+}
+
 
 static PyMethodDef winapi_functions[] = {
     _WINAPI_CLOSEHANDLE_METHODDEF
@@ -3228,6 +3245,7 @@ static PyMethodDef winapi_functions[] = {
     _WINAPI_COPYFILE2_METHODDEF
     _WINAPI_GETPROCESSMEMORYINFO_METHODDEF
     _WINAPI_GETTICKCOUNT64_METHODDEF
+    _WINAPI_ISWINDOWSDESKTOP_METHODDEF
     {NULL, NULL}
 };