Adobe Muse how to create another index page with a non-root folder

I hope, why is out of the question. For example my website is sibiriak.com and I want every page to be in the format "sibiriak.com/page/"  instead of "sibiriak.com/page.html. Couldn't find this information anywhere and I'm guessing I'm not the first one banging my head on the wall about that. Yes, I can create the wanted page as a separate on page site and put it into the folder which is exactly what I have to do so far. But that's hard to manage in Muse and what's a point of having the hierarchy feature without being able to create the real hierarchy in the website. Also, separate page site leads to additional space for the same scripts.