Used document MIME type when downloading otherwise use 'application/octet-stream' if none

apps/documents/views.py

@@ -575,7 +575,12 @@ def document_download(request, document_id):
     try:
         #Test permissions and trigger exception
         document.open()
-        return serve_file(request, document.file, save_as=u'"%s"' % document.get_fullname(), content_type='image/jpeg')
+        return serve_file(
+            request,
+            document.file,
+            save_as=u'"%s"' % document.get_fullname(),
+            content_type=document.file_mimetype if document.file_mimetype else 'application/octet-stream'
+        )
     except Exception, e:
         messages.error(request, e)
         return HttpResponseRedirect(request.META['HTTP_REFERER'])