From Mathias Svensson:
Multi Commander Portable is a multi-tabbed file manager that is an alternative to the standard Windows Explorer. It uses efficient dual-panel layout. And has everything you need in your daily work with files to make you work fast and efficient. It has all the standard features like a file manager has like copy, move, rename, view. But Multi Commanders big strength is the special features that allow you to do advanced task with ease. Like Auto-unpacking, Auto-sorting, Browse inside archives, Workspace support, Scripting, Searching. And it allows you to do everything from the keyboard.