Ticket #11864: t11864-m4b-mime-type.diff

wp-includes/functions.php

@@ -2284 +2284 @@
                 'rtx' => 'text/richtext',
                 'css' => 'text/css',
                 'htm|html' => 'text/html',
-                'mp3|m4a' => 'audio/mpeg',
+                'mp3|m4a|m4b' => 'audio/mpeg',
                 'mp4|m4v' => 'video/mp4',
                 'ra|ram' => 'audio/x-realaudio',
                 'wav' => 'audio/wav',