Issue #12037: Fix test_email for desktop Windows.

Lib/test/test_email/test_email.py

@@ -180,8 +180,8 @@ class TestMessageAPI(TestEmailBase):
 
     def test_byte_message_rfc822_only(self):
         # Make sure new bytes header parser also passes this.
-        with openfile('msg_46.txt', 'rb') as fp:
-            msgdata = fp.read()
+        with openfile('msg_46.txt') as fp:
+            msgdata = fp.read().encode('ascii')
         parser = email.parser.BytesHeaderParser()
         msg = parser.parsebytes(msgdata)
         out = BytesIO()

Misc/NEWS

@@ -314,6 +314,8 @@ IDLE
 Tests
 -----
 
+- Issue #12037: Fix test_email for desktop Windows.
+
 - Issue #15507: test_subprocess's test_send_signal could fail if the test
   runner were run in an environment where the process inherited an ignore
   setting for SIGINT.  Restore the SIGINT handler to the desired