diff --git a/PFERD/ilias_authenticators.py b/PFERD/ilias_authenticators.py
index 57ae94c..1924554 100644
--- a/PFERD/ilias_authenticators.py
+++ b/PFERD/ilias_authenticators.py
@@ -28,7 +28,10 @@ class ShibbolethAuthenticator:
         "application/zip",
         "application/msword",
         "application/vnd.wolfram.nb",
+        "application/octet-stream",
+        "application/excel",
         "text/xml",
+        "text/xml;charset=UTF-8",
         "text/plain",
         "image/jpeg",
         "image/png",