title: Amazon sitemap data in xml.gz form uncompressable
body: <p>this might be a very dumb question but.. I'm trying to get the amazon sitemap and I have looked at amazon.com/robots.txt. They have a few .xml.gz files for their sitemap which I have downloaded. The problem that I'm having is that I cannot unzip them. I feel like I'm  missing something very obvious.</p>
  
  <p>For example, one sitemap is: <a href="http://www.amazon.com/sitemaps.f3053414d236e84.SitemapIndex_0.xml.gz" rel="nofollow">http://www.amazon.com/sitemaps.f3053414d236e84.SitemapIndex_0.xml.gz</a></p>
  
  <p>Thanks!</p>