diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index cefdb82437..c7bb04636a 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -703,6 +703,9 @@ $_old_files = array(
 'wp-includes/js/tinymce/plugins/wpfullscreen',
 // 4.5
 'wp-includes/theme-compat/comments-popup.php',
+// 4.9.2
+'wp-includes/js/mediaelement/flashmediaelement.swf',
+'wp-includes/js/mediaelement/silverlightmediaelement.xap',
 );
 
 /**
diff --git a/wp-includes/js/mediaelement/flashmediaelement.swf b/wp-includes/js/mediaelement/flashmediaelement.swf
deleted file mode 100644
index 4546a38325..0000000000
Binary files a/wp-includes/js/mediaelement/flashmediaelement.swf and /dev/null differ
diff --git a/wp-includes/js/mediaelement/silverlightmediaelement.xap b/wp-includes/js/mediaelement/silverlightmediaelement.xap
deleted file mode 100644
index 3704748fdf..0000000000
Binary files a/wp-includes/js/mediaelement/silverlightmediaelement.xap and /dev/null differ