diff --git a/common/lib/xmodule/xmodule/modulestore/xml_importer.py b/common/lib/xmodule/xmodule/modulestore/xml_importer.py
index 2beeab75a5..3c5db7459d 100644
--- a/common/lib/xmodule/xmodule/modulestore/xml_importer.py
+++ b/common/lib/xmodule/xmodule/modulestore/xml_importer.py
@@ -35,6 +35,9 @@ def import_static_content(
         policy = {}
 
     verbose = True
+
+    mimetypes.add_type('application/octet-stream', '.sjson')
+    mimetypes.add_type('application/octet-stream', '.srt')
     mimetypes_list = mimetypes.types_map.values()
 
     for dirname, _, filenames in os.walk(static_dir):