installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/inc/mime/cssjs.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * CSS and JS mime types
+ */
+return array(
+	'css' => 'text/css',
+	'htc' => 'text/x-component',
+	'less' => 'text/css',
+	//JS - varieties
+	'js' => 'application/x-javascript',
+	'js2' => 'application/javascript',
+	'js3' => 'text/javascript',
+	'js4' => 'text/x-js',
+);