Enthuware

Regarding to this

For example, if the Web Application is stored in c:\tomcat\webapps\MyWebApp, the MyWebApp directory is the context root.

In NetBean, if I change the context root into foo while the web application is still in c:\tomcat\webapps\MyWebApp, the /WEB-INF/data.zip can still be found !

An application container can allow you to bind any directory (i.e. document root) to any context. You can read about configuration options provided by tomcat. It uses server.xml for this purpose.
-Paul.