Index: django/http/__init__.py
===================================================================
--- django/http/__init__.py	(revision 5428)
+++ django/http/__init__.py	(working copy)
@@ -67,7 +67,7 @@
                 FILES.appendlist(name_dict['name'], {
                     'filename': filename,
                     'content-type': 'Content-Type' in submessage and submessage['Content-Type'] or None,
-                    'content': submessage.get_payload(),
+                    'content': submessage.get_payload(decode=True),
                 })
             else:
                 POST.appendlist(name_dict['name'], submessage.get_payload())