How to make a .xml sitemap in ASP

I have a local news site and I wanna faster indexing by Google, Yandex and others. The SEO masters says that , the easiest way of it is sending a sitemap to search engines. My used script is so old 'n it written in ASP. I have a .asp extension sitemap but Google is preffering .xml to others. So, how can I convert a .asp extension to .xml ? Thanks.