Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 13211)
+++ wp-includes/functions.php	(working copy)
@@ -2310,8 +2310,8 @@
  */
 function wp_ext2type( $ext ) {
 	$ext2type = apply_filters( 'ext2type', array(
-		'audio'       => array( 'aac', 'ac3',  'aif',  'aiff', 'm3a',  'm4a',   'm4b', 'mka', 'mp1', 'mp2',  'mp3', 'ogg', 'ram', 'wav', 'wma' ),
-		'video'       => array( 'asf', 'avi',  'divx', 'dv',   'flv',  'm4v',   'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'mpv', 'ogm', 'qt',  'rm', 'vob', 'wmv' ),
+		'audio'       => array( 'aac', 'ac3',  'aif',  'aiff', 'm3a',  'm4a',   'm4b', 'mka', 'mp1', 'mp2',  'mp3', 'ogg', 'oga', 'ram', 'wav', 'wma' ),
+		'video'       => array( 'asf', 'avi',  'divx', 'dv',   'flv',  'm4v',   'mkv', 'mov', 'mp4', 'mpeg', 'mpg', 'mpv', 'ogm', 'ogv', 'qt',  'rm', 'vob', 'wmv' ),
 		'document'    => array( 'doc', 'docx', 'docm', 'dotm', 'odt',  'pages', 'pdf', 'rtf' ),
 		'spreadsheet' => array( 'numbers',     'ods',  'xls',  'xlsx', 'xlsb',  'xlsm' ),
 		'interactive' => array( 'key', 'ppt',  'pptx', 'pptm', 'odp',  'swf' ),
@@ -2386,7 +2386,8 @@
 		'mp4|m4v' => 'video/mp4',
 		'ra|ram' => 'audio/x-realaudio',
 		'wav' => 'audio/wav',
-		'ogg' => 'audio/ogg',
+		'ogg|oga' => 'audio/ogg',
+		'ogv' => 'video/ogg',
 		'mid|midi' => 'audio/midi',
 		'wma' => 'audio/wma',
 		'mka' => 'audio/x-matroska',