15847 Sitemap Link Extractor

Hello, I need a desktop application that extracts links from my own websites sitemaps and stores them to a .txt file. I will enter about 100 urls of sitemaps.php. The software then goes to each site and grabs the let's say first 50 url on the sitemap and stores them in a .txt file. Then goes to the next [login to view URL] url, grabs again the first 50 links and stores them in the SAME .txt file. The number of urls to grab should be changeable. In my example I mentioned 50 urls. The [login to view URL] the software will have to extract links from always looks exactly the same. I need the script asap!!!