I will be modify my robots.txt and validated my sitemap.xml
I too put the file http://www.netdownloads.com.br/sitemap.xml on webmaster tools sitemap session.
robots.txt content
User-agent: *
Disallow: /cgi-bin/
Sitemap: http://www.netdownloads.com.br/sitemap.xml
Sitemap: http://www.netdownloads.com.br/sitemap.xml.gz
Disallow: /show.php
regards,
edmilson