diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index c377953b9e..caefe80c6a 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -705,6 +705,9 @@ $_old_files = array(
 'wp-includes/theme-compat/comments-popup.php',
 // 4.6
 'wp-admin/includes/class-wp-automatic-upgrader.php', // Wrong file name, see #37628.
+// 4.9.2
+'wp-includes/js/mediaelement/flashmediaelement.swf',
+'wp-includes/js/mediaelement/silverlightmediaelement.xap',
 );
 
 /**
diff --git a/src/wp-includes/js/mediaelement/flashmediaelement.swf b/src/wp-includes/js/mediaelement/flashmediaelement.swf
deleted file mode 100644
index 8e689ebd62..0000000000
Binary files a/src/wp-includes/js/mediaelement/flashmediaelement.swf and /dev/null differ
diff --git a/src/wp-includes/js/mediaelement/silverlightmediaelement.xap b/src/wp-includes/js/mediaelement/silverlightmediaelement.xap
deleted file mode 100644
index 38a9cc490b..0000000000
Binary files a/src/wp-includes/js/mediaelement/silverlightmediaelement.xap and /dev/null differ