Using a Windows machine as an intranet server

I have an internet modem/router which I use to create an intranet. One of the computers on the intranet is a Windows 10 machine using WAMP and Apache to create an HTTP server. The router (Xfinity) does not seem to have a DNS but my Windows machine is named “iolanthe” so other clients on the intranet can address the server as “http://iolanthe/index.php.” The problem is that this always goes to C:/Users/username/www. Is there any way to get it to go to another directory, like C:/Users/username/www/foo/foo.com/index.php?