Anytime I have created a Power CMS Builder site, it has always created an admin_cms folder, a cms folder, a connections folder, and all the others.
Inside the cms folder is an index.php file with a php header redirect file.
I just noticed on two new sites I created with Design Extender (instead of Power CMS Builder) that it did not create this folder.
I find that the cms folder was a nice "friendly" url I could provide my clients to login to the CMS versus the lengthy file URL as it would exist right now.
Of course it is easy to create a folder and a php with a header redirect. I just wanted you to know it appeared to be "missing".