docx and xlsx have a zip/application mimetype
diff --git a/application/config/mimes.php b/application/config/mimes.php
index f00e5b6..100f7d4 100644
--- a/application/config/mimes.php
+++ b/application/config/mimes.php
@@ -93,8 +93,8 @@
'avi' => 'video/x-msvideo',
'movie' => 'video/x-sgi-movie',
'doc' => 'application/msword',
- 'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
- 'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+ 'docx' => array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'),
+ 'xlsx' => array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'),
'word' => array('application/msword', 'application/octet-stream'),
'xl' => 'application/excel',
'eml' => 'message/rfc822',