Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 68473)
+++ Modules/posixmodule.c	(working copy)
@@ -270,6 +270,11 @@
 #endif
 #include "osdefs.h"
 #include <windows.h>
+/* Some SDKs don't define this value for use with GetFileAttributes(),
+so we simply add it if not. */
+#if !defined(INVALID_FILE_ATTRIBUTES)
+#  define INVALID_FILE_ATTRIBUTES 0xffffffffu
+#endif
 #include <shellapi.h>	/* for ShellExecute() */
 #define popen	_popen
 #define pclose	_pclose
@@ -905,7 +910,7 @@
 	/* Use GetFileAttributes to validate that the file name
 	   does not contain wildcards (which FindFirstFile would
 	   accept). */
-	if (GetFileAttributesA(pszFile) == 0xFFFFFFFF)
+	if (GetFileAttributesA(pszFile) == INVALID_FILE_ATTRIBUTES)
 		return FALSE;
 	return attributes_from_dir(pszFile, pfad);
 }
@@ -935,7 +940,7 @@
 	/* Use GetFileAttributes to validate that the file name
 	   does not contain wildcards (which FindFirstFile would
 	   accept). */
-	if (GetFileAttributesW(pszFile) == 0xFFFFFFFF)
+	if (GetFileAttributesW(pszFile) == INVALID_FILE_ATTRIBUTES)
 		return FALSE;
 	return attributes_from_dir_w(pszFile, pfad);
 }
@@ -1525,13 +1530,13 @@
 	}
 	if (!PyArg_ParseTuple(args, "eti:access",
 			      Py_FileSystemDefaultEncoding, &path, &mode))
-		return 0;
+		return NULL;
 	Py_BEGIN_ALLOW_THREADS
 	attr = GetFileAttributesA(path);
 	Py_END_ALLOW_THREADS
 	PyMem_Free(path);
 finish:
-	if (attr == 0xFFFFFFFF)
+	if (attr == INVALID_FILE_ATTRIBUTES)
 		/* File does not exist, or cannot read attributes */
 		return PyBool_FromLong(0);
 	/* Access is possible if either write access wasn't requested, or
@@ -1668,7 +1673,7 @@
 		if (PyArg_ParseTuple(args, "Ui|:chmod", &po, &i)) {
 			Py_BEGIN_ALLOW_THREADS
 			attr = GetFileAttributesW(PyUnicode_AS_UNICODE(po));
-			if (attr != 0xFFFFFFFF) {
+			if (attr != INVALID_FILE_ATTRIBUTES) {
 				if (i & _S_IWRITE)
 					attr &= ~FILE_ATTRIBUTE_READONLY;
 				else
@@ -1693,7 +1698,7 @@
 		return NULL;
 	Py_BEGIN_ALLOW_THREADS
 	attr = GetFileAttributesA(path);
-	if (attr != 0xFFFFFFFF) {
+	if (attr != INVALID_FILE_ATTRIBUTES) {
 		if (i & _S_IWRITE)
 			attr &= ~FILE_ATTRIBUTE_READONLY;
 		else
Index: PC/bdist_wininst/extract.c
===================================================================
--- PC/bdist_wininst/extract.c	(revision 68473)
+++ PC/bdist_wininst/extract.c	(working copy)
@@ -8,6 +8,11 @@
 */
 
 #include <windows.h>
+/* Some SDKs don't define this value for use with GetFileAttributes(),
+so we simply add it if not. */
+#if !defined(INVALID_FILE_ATTRIBUTES)
+#  define INVALID_FILE_ATTRIBUTES 0xffffffffu
+#endif
 
 #include "zlib.h"
 
@@ -32,7 +37,7 @@
 		DWORD attr;
 		*new_part = '\0';
 		attr = GetFileAttributes(pathname);
-		if (attr == -1) {
+		if (attr == INVALID_FILE_ATTRIBUTES) {
 			/* nothing found */
 			if (!CreateDirectory(pathname, NULL) && notify)
 				notify(SYSTEM_ERROR,