More feature-packed than Windows Explorer, 2xExplorer Z1 is nonetheless so lightweight it doesn't require installation. Like Total Commander and FAR, 2xExplorer Z1 has two panels for browsing folders, and you can toggle a third that contains a folder tree. The busy interface conceals several handy options for selecting files, such as filters and Sticky Selection.
You'll also find bonus tools that let you split files, shred documents to prevent their recovery, and create hard links on NTFS drives. Power users ought to love this replacement for the Windows File Manager. It's not long on looks, but it's fast, powerful, and totally free.