Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 5243)
+++ wp-includes/functions.php	(working copy)
@@ -1189,6 +1189,7 @@
 		'js' => 'application/javascript',
 		'pdf' => 'application/pdf',
 		'doc' => 'application/msword',
+		'odt' => 'application/vnd.oasis.opendocument.text',
 		'pot|pps|ppt' => 'application/vnd.ms-powerpoint',
 		'wri' => 'application/vnd.ms-write',
 		'xla|xls|xlt|xlw' => 'application/vnd.ms-excel',