Mapping 'virtual directories' without using IIS

Let's say I have www.something.com that maps to c:\inetpub\wwwroot\something

I also have www.something.com/newapp which maps to c:\inetpub\wwwroot\newapp (note the absence of 'something' in that path).

Now, I am aware that I can do this in IIS by creating a virtual directory beneath something.com.

However, if I wanted to do this without using IIS, how can this be done? In other words, I need the 2nd URL mapped to a separate directory without having to enter the HTTP Pipeline. I was thinking, perhaps, something to do with a load balancer?

Any other suggestions welcome.

Yeah I could write one. It'll probably act as a rewriter and stream the contents but there's too much more to take care of. No, I don't think this is a good question. I'm talking to myself now.