diff --git a/irfm/tools/files.py b/irfm/tools/files.py
index e64732aca704e4871b4189850ecae5ea66ac85bd..776fe3628058e4227054196c09466328bb1e1941 100644
--- a/irfm/tools/files.py
+++ b/irfm/tools/files.py
@@ -17,6 +17,8 @@ EXTENSIONS = {
     'jpg': 'image/jpeg',
     'jpeg': 'image/jpeg',
     'png': 'image/png',
+    'csv': 'text/csv',
+    'xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
 }