diff --git src/wp-includes/media.php src/wp-includes/media.php
index 6843c61b21..1b608d3fbd 100644
--- src/wp-includes/media.php
+++ src/wp-includes/media.php
@@ -2159,9 +2159,9 @@ function wp_get_audio_extensions() {
 	 * @since 3.6.0
 	 *
 	 * @param array $extensions An array of support audio formats. Defaults are
-	 *                          'mp3', 'ogg', 'wma', 'm4a', 'wav'.
+	 *                          'mp3', 'ogg', 'm4a', 'wav'.
 	 */
-	return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'wma', 'm4a', 'wav' ) );
+	return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'm4a', 'wav' ) );
 }
 
 /**
@@ -2392,9 +2392,9 @@ function wp_get_video_extensions() {
 	 * @since 3.6.0
 	 *
 	 * @param array $extensions An array of support video formats. Defaults are
-	 *                          'mp4', 'm4v', 'webm', 'ogv', 'wmv', 'flv'.
+	 *                          'mp4', 'm4v', 'webm', 'ogv', 'flv'.
 	 */
-	return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'wmv', 'flv' ) );
+	return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'flv' ) );
 }
 
 /**