Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(revision 61514)
+++ Lib/subprocess.py	(working copy)
@@ -784,7 +784,7 @@
                 startupinfo.dwFlags |= STARTF_USESHOWWINDOW
                 startupinfo.wShowWindow = SW_HIDE
                 comspec = os.environ.get("COMSPEC", "cmd.exe")
-                args = comspec + " /c " + args
+                args = comspec + " /c " + '"%s"' % args
                 if (GetVersion() >= 0x80000000L or
                         os.path.basename(comspec).lower() == "command.com"):
                     # Win9x, or using command.com on NT. We need to
Index: Lib/test/test_subprocess.py
===================================================================
--- Lib/test/test_subprocess.py	(revision 61514)
+++ Lib/test/test_subprocess.py	(working copy)
@@ -39,12 +39,12 @@
         if hasattr(test_support, "reap_children"):
             test_support.reap_children()
 
-    def mkstemp(self):
+    def mkstemp(self, *args, **kwargs):
         """wrapper for mkstemp, calling mktemp if mkstemp is not available"""
         if hasattr(tempfile, "mkstemp"):
-            return tempfile.mkstemp()
+            return tempfile.mkstemp(*args, **kwargs)
         else:
-            fname = tempfile.mktemp()
+            fname = tempfile.mktemp(*args, **kwargs)
             return os.open(fname, os.O_RDWR|os.O_CREAT), fname
 
     #
@@ -654,8 +654,63 @@
             rc = subprocess.call(sys.executable +
                                  ' -c "import sys; sys.exit(47)"')
             self.assertEqual(rc, 47)
+            
+        def test_shell_string_with_spaces(self):
+            # call() function with string argument with spaces on Windows
+            f, fname = self.mkstemp(".py", "te st")
+            try:
+                os.write(f, "import sys;"\
+                        "sys.stdout.write('%d %s' % (len(sys.argv), sys.argv))")
+                os.close(f)
+                p = subprocess.Popen('"%s" "%s"' % (fname, "ab cd"), shell=1, 
+                                     stdout=subprocess.PIPE)
+                self.assertEqual(p.stdout.read(), 
+                                 "2 [%r, 'ab cd']" % fname)
+            finally:
+                os.remove(fname)
 
+        def test_shell_sequence_with_spaces(self):
+            # call() function with sequence argument with spaces on Windows
+            f, fname = self.mkstemp(".py", "te st")
+            try:
+                os.write(f, "import sys;"\
+                        "sys.stdout.write('%d %s' % (len(sys.argv), sys.argv))")
+                os.close(f)
+                p = subprocess.Popen([fname, "ab cd"], shell=1, 
+                                     stdout=subprocess.PIPE)
+                self.assertEqual(p.stdout.read(),
+                                 "2 [%r, 'ab cd']" % fname)
+            finally:
+                os.remove(fname)
 
+        def test_noshell_string_with_spaces(self):
+            # call() function with string argument with spaces on Windows
+            f, fname = self.mkstemp(".py", "te st")
+            try:
+                os.write(f, "import sys;"\
+                        "sys.stdout.write('%d %s' % (len(sys.argv), sys.argv))")
+                os.close(f)
+                p = subprocess.Popen('"%s" "%s" "%s"' % (sys.executable, fname,
+                                     "ab cd"), stdout=subprocess.PIPE)
+                self.assertEqual(p.stdout.read(),
+                                 "2 [%r, 'ab cd']" % fname)
+            finally:
+                os.remove(fname)
+
+        def test_noshell_sequence_with_spaces(self):
+            # call() function with sequence argument with spaces on Windows
+            f, fname = self.mkstemp(".py", "te st")
+            try:
+                os.write(f, "import sys;"\
+                        "sys.stdout.write('%d %s' % (len(sys.argv), sys.argv))")
+                os.close(f)
+                p = subprocess.Popen([sys.executable, fname, "ab cd"], 
+                                     stdout=subprocess.PIPE)
+                self.assertEqual(p.stdout.read(), 
+                                 "2 [%r, 'ab cd']" % fname)
+            finally:
+                os.remove(fname)
+
 def test_main():
     test_support.run_unittest(ProcessTestCase)
     if hasattr(test_support, "reap_children"):