Idea for a Full Sub-tree view in Windows Explorer

Windows Explorer provides several different views of your files and directories: as a listing, as a grid of icons, etc. I’d like a ‘full sub-tree’ view. Rather than just listing just the directory contents, it would show the entire subtree of directories and files underneath the directory, like:

   File
   File
   File 
   Subdir name
     File
     File
     Subdir name
        File
        File
        File
     File

I often find I want to be able to see all those details at once, rather than being limited to seeing each directory one at a timne.