diff --git a/application/config/mimes.php b/application/config/mimes.php
index a239bb2..6cc1ae9 100644
--- a/application/config/mimes.php
+++ b/application/config/mimes.php
@@ -56,7 +56,7 @@
 	'smi'	=>	'application/smil',
 	'smil'	=>	'application/smil',
 	'mif'	=>	'application/vnd.mif',
-	'xls'	=>	array('application/excel', 'application/vnd.ms-excel', 'application/msexcel'),
+	'xls'	=>	array('application/vnd.ms-excel', 'application/vnd.ms-excel [official]', 'application/msexcel', 'application/x-msexcel', 'application/x-ms-excel', 'application/x-excel', 'application/x-dos_ms_excel', 'application/xls', 'application/x-xls', 'application/excel', 'application/download', 'application/vnd.ms-office', 'application/msword'),
 	'ppt'	=>	array('application/powerpoint', 'application/vnd.ms-powerpoint'),
 	'pptx'	=> 	'application/vnd.openxmlformats-officedocument.presentationml.presentation',
 	'wbxml'	=>	'application/wbxml',
@@ -124,7 +124,7 @@
 	'movie'	=>	'video/x-sgi-movie',
 	'doc'	=>	array('application/msword', 'application/vnd.ms-office'),
 	'docx'	=>	array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'),
-	'xlsx'	=>	array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'),
+	'xlsx'	=>	array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip', 'application/vnd.ms-excel', 'application/msword'),
 	'word'	=>	array('application/msword', 'application/octet-stream'),
 	'xl'	=>	'application/excel',
 	'eml'	=>	'message/rfc822',