diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index e1b0f9e665..f726529e8e 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -694,7 +694,10 @@ $_old_files = array(
 'wp-includes/js/jquery/ui/jquery.ui.tabs.min.js',
 'wp-includes/js/jquery/ui/jquery.ui.tooltip.min.js',
 'wp-includes/js/jquery/ui/jquery.ui.widget.min.js',
-'wp-includes/js/tinymce/skins/wordpress/images/dashicon-no-alt.png'
+'wp-includes/js/tinymce/skins/wordpress/images/dashicon-no-alt.png',
+// 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 127de920bc..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