如果指定，将导致为该应用程序创建根虚拟目录。如果忽略，将创建一个没有根虚拟目录的应用程序，并且该应用程序在创建根虚拟目录之前将不可用。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

If specified, will cause the root virtual directory to be created for this application. If omitted, the application will be created without a root virtual directory and will not be usable until one is created.

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