IIS and virtual directory

[GASNIER Lise]

Hi,
I use Tomcat in addition to IIS.
I have a WAR: bookstore.war.
I want to create a virtual directory. But using IIS, when I define the
document root path, it must relate to a real physical path which doesn't
exist before the expansion of the WAR.
The problem is if I create a directory named bookstore under webapps before
starting TOMCAT, the  War file won't expand.
So What do I have to do?
Thanks in advance for your help.
Lise