Assing NT user to PHP cgi Process.

(Win NT 4.0, IIS 4.0) Hi, I've made a script to create some sub-folders to my web root. To turn around security problems (like set the root or another sub-folder as "Everyone change") I would like to create and use an NT user to assign to the PHP process and then assign security permission just for this user. At worst i'll use "IUSR_myserver" but I'll prefer to use a dedicated user. Have some one an idea to do that? Thanks, Alessio