Index: Python/import.c
===================================================================
--- Python/import.c	(revision 73511)
+++ Python/import.c	(working copy)
@@ -881,7 +881,11 @@
 {
 	FILE *fp;
 	time_t mtime = srcstat->st_mtime;
-	mode_t mode = srcstat->st_mode;
+#ifdef MS_WINDOWS   /* since Windows uses different permissions  */
+	mode_t mode = srcstat->st_mode & ~S_IEXEC;
+#else
+	mode_t mode = srcstat->st_mode & ~S_IXUSR & ~S_IXGRP & ~S_IXOTH;
+#endif 
 
 	fp = open_exclusive(cpathname, mode);
 	if (fp == NULL) {