File permissions on Windows, IIS

I have a Windows XP pro with IIS 5.1 and Php 4.3.3 which I use for local development, and I'm trying to use a bunch of the file commands for making a very simple file manager application. However, I can't seem to get most of them to work, i.e. mkdir(). I get a permission denied message. I have researched the problem and it seems I don't have the correct permissions in the directory to do this, and one way to fix this is to use chmod to set it to 777. But that seems to be a Unix only command, so it doesn't work for me. Does anyone have any idea on how I will get these commands to work on my local machine? How do I change file permissions to make it "identical" to the chmod 777 on Unix systems. Thanks a lot for any help... Marius