A FileFolder is a modified Folder. It differs from the regular Folder in that only File objects (instead of DTMLDocuments or Images) are created when using HTTP PUT or FTP STOR in the folder, and FileFolders are created (instead of Folders) when using WebDAV MKCOL or FTP MKD.
This product was created so I can use Zope as, basically, an vanilla integrated HTTP / FTP / DAV server and give access to unsophisticated users with tools like a FTP client. Those users need not be aware of anything about Zope programming.