diff -r 6c6f1e107cfe Lib/mimetypes.py
--- a/Lib/mimetypes.py	Thu Jul 23 08:09:05 2015 +1200
+++ b/Lib/mimetypes.py	Wed Jul 22 23:59:59 2015 -0500
@@ -446,6 +446,8 @@
         '.mht'    : 'message/rfc822',
         '.mhtml'  : 'message/rfc822',
         '.mif'    : 'application/x-mif',
+        '.mmpz'   : 'application/octet-stream',
+        '.mmp'    : 'application/octet-stream',
         '.mov'    : 'video/quicktime',
         '.movie'  : 'video/x-sgi-movie',
         '.mp2'    : 'audio/mpeg',
diff -r 6c6f1e107cfe Lib/test/test_mimetypes.py
--- a/Lib/test/test_mimetypes.py	Thu Jul 23 08:09:05 2015 +1200
+++ b/Lib/test/test_mimetypes.py	Wed Jul 22 23:59:59 2015 -0500
@@ -19,6 +19,7 @@
     def test_default_data(self):
         eq = self.assertEqual
         eq(self.db.guess_type("foo.html"), ("text/html", None))
+        eq(self.db.guess_type("foo.mmp"), ("application/octet-stream", None))
         eq(self.db.guess_type("foo.tgz"), ("application/x-tar", "gzip"))
         eq(self.db.guess_type("foo.tar.gz"), ("application/x-tar", "gzip"))
         eq(self.db.guess_type("foo.tar.Z"), ("application/x-tar", "compress"))