Visual Studio 2012 automatically creates a virtual directory in IIS 7 at startup

Question

I have a web project hosted in another IIS 7 web project.

My settings are as follows:

Project Properties → Web

Use local web server [checked]

Use IIS Express [unverified]

Project URL : localhost / BIG_PROJECT / My_small_project

Project Propertirs → Build

Output path: * .. \ bin *

There is a virtual directory for BIG_PROJECT. Good.

But every time I open My_small_project in Visual Studio 2012, it automatically creates a virtual directory for My_small_project.

Is it possible to disable this setting?