Well the title is pretty clear what i need appart from not being able to use iis manager, htacces because im not on linux and needs to be a 301 redirect Redirect Mysite.com, www.mysite.com/index.htm to www.mysite.com or to root as otherwise called
Only other way you could do it is add a redirect header to index.htm that would redirect back to mysite.com. Don't see why you would do that, maybe use index.php as a means to load your site.
front controller approach should help resolve such an issue. That is every request is directed to single script which decides where to go further.