Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.
diff --git a/Modules/_fileio.c b/Modules/_fileio.c
index 409abf6..efe0855 100644
--- a/Modules/_fileio.c
+++ b/Modules/_fileio.c
@@ -178,7 +178,7 @@
 	else {
 		PyErr_Clear();
 
-#ifdef Py_WIN_WIDE_FILENAMES
+#ifdef MS_WINDOWS
 	    if (GetVersion() < 0x80000000) {
 		/* On NT, so wide API available */
 		PyObject *po;