diff --git a/conf/mime.types b/conf/mime.types
index 45b1f14cd..6d2bfd6c7 100644
--- a/conf/mime.types
+++ b/conf/mime.types
@@ -61,6 +61,10 @@ types {
     application/octet-stream              iso img;
     application/octet-stream              msi msp msm;
 
+    application/vnd.openxmlformats-officedocument.wordprocessingml.document    docx;
+    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet          xlsx;
+    application/vnd.openxmlformats-officedocument.presentationml.presentation  pptx;
+
     audio/midi                            mid midi kar;
     audio/mpeg                            mp3;
     audio/ogg                             ogg;