diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index 2b02af6c45..02d60d1b4a 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -659,6 +659,9 @@ $_old_files = array(
 'wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js',
 'wp-includes/js/tinymce/plugins/paste/pastetext.htm',
 'wp-includes/js/tinymce/langs/wp-langs.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 5998d67699..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 9d55c2e46a..0000000000
Binary files a/wp-includes/js/mediaelement/silverlightmediaelement.xap and /dev/null differ