Go Top 100 does not make any changes to the URL. That would be blogger doing it (or whatever blog service you are talking about). We have the url YOU entered in our database and that is exactly where we send people who click on your link.
It is actually not physically possible. How would we know if a site was on index.html, index.php, index.asp? I'd have to manually check every single site on every single top list and manually change the URL myself and why on earth would I do that?