favicon.ico - default file name for your website icon shown in the address bar of the browser. As for how can it get to 200% - not sure
I think awstats only counts a page if the whole thing has been downloaded. Several spiders just download the header, so their view doesn't add to the page count. All your images are in the body, but your favicon (the graphic that appears in the browser bar) is located in your header. So basically you're seeing 200% downloads of your favicon because you have just as many pageviews from robots crawling your header as you do visitors reading the entire page. At least that's my guess as to what is happening.