Local web sites can be loaded via the command line or via the right-click "edit url" option.
This will disable security for that window, allowing local file access; please keep in mind that this can give any website (local or remote) access to your local file system if loaded. That window will be "tainted", and should be closed and a new window opened before navigating to untrusted websites.
For security purposes, accessing local files via the normal landing page is disabled.