I don't think that's changed, it's just that /foo is an alias for /scheme/file/foo.

You could roughly emulate it on Unix by assuming every filename starting /scheme/bar/ is a bar-type (special) file, but nothing stops you creating (and you'd necessarily have) 'files' of any type outside that. In Redox, everything has that scheme prefix describing its type (and if omitted, it's implicitly /scheme/file/).