I don't know where you have found the correct User Agent String,
anway, I just wanted to share my source which helped me to solve this challenge,
it's quite interesting and funny http://www.webaim.org/blog/user-agent-string-history/
i googled, found nothing although i knew it was mosaic.
then i just asked someone who found it easily with google: http://www.peterknaak.de/uas.html
i feel so stupid
webaim also did the trick for me. Having solved the quest glowing referral helped me out on this one, since I didn't know before how to spoof header content