Secondly: WinFS IS NOT A FILESYSTEM!!! It's a storage system for file metadata. The WINFS store is a file in a directory on an NTFS partition. It's NOT a filesystem in its own right. You don't put files in WinFS, you put file metadata in WinFS.
There's a BIG difference.
It is a file system, you can put files into it, create folder structures, access the files thru UNC path. I've been copying images, music, text files and what not into the WinFS store of my Longhorn installation. They were INSIDE the store, I had to access
them a la \\localmachine\DefaultStore\folder\anotherfolder\coolpicture.jpg.
Ok, technically the filestreams go onto NTFS, but everything is abstracted by WinFS. At some later point this could very well change, and noone would notice (unless you're eagle eyeing your System Information Folder).