The IP is the address of some device. It can be your server and your server can indeed have multiple IPs but what's at that IP and what protocol determines what happens next.

In your case I'm GUESSING you want a list of files to show up like some small file explorer but over a web browser. For that, your server would have to do that. This is not as trivial as you wanted it to be so to me, Virtual Directory is not my path here.

However this is specific to your web server. If you are using Microsoft's own read:
https://support.microsoft.com/en-us/kb/308150

http://stackoverflow.com/questions/5796215/an-url-to-a-windows-shared-folder notes that for the URL you have to escape slashes.