In Wikipedia's "http://en.wikipedia.org/robots.txt" file, one can read:
# zh: # https://bugzilla.wikimedia.org/show_bug.cgi?id=5104 Disallow: /wiki/Wikipedia:å é¤æ票/ä¾µæ Disallow: /wiki/Wikipedia:%E5%88%A0%E9%99%A4%E6%8A%95%E7%A5%A8/%E4%BE%B5%E6%9D%83
As you can see from the abbreviation ZH this is Chinese text. And the encoding of the file is UTF-8. If you view the file in your browser you have to make sure it uses the correct encoding. Though you will only see the Chinese characters if you have a proper font installed on your PC.
hth Frank