Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 24501)
+++ wp-includes/functions.php	(working copy)
@@ -1994,6 +1994,10 @@
 	'odf' => 'application/vnd.oasis.opendocument.formula',
 	// WordPerfect formats
 	'wp|wpd' => 'application/wordperfect',
+	// iWork formats
+	'key' => 'application/vnd.apple.keynote',
+	'numbers' => 'application/vnd.apple.numbers',
+	'pages' => 'application/vnd.apple.pages',
 	) );
 }
 /**