Using Leopard 10.5.1

Just started playing w/ Pathfinder. Was disappointed that Cmd + Opt + y will not launch text file, video, or image full-screen w/o opening accompanying app as Finder can do. This Finder file launching feature is pretty slick and fast. Couldn't see anything in Path Finder's preferences to activate this feature. Pathfinder does visually represent directory structure more elegantly in many ways. Like the way Path Finder segregates folders together separate from individual files in a directory. Finder's small thumbnail images beside file name can be helpful at times which I don't think is a Pathfinder feature? Caveat: this is IMHO as I just downloaded Pathfinder today.