One Cat File Manager starts with the familiar interface of the Windows shell, and then integrates the functionality it left out. Side by side file management - up to four directory panes, easy multiple file renaming, full-featured thumbnail viewer and editor for pictures and video, quick access to navigation history, directory synchronization, file cataloging, archive extraction (RAR, ARC, ZIP), start-up program management and customizable looks combine to make the perfect file manager. While One Cat File Manager is a vast improvement over the built-in file manager, using it is not wildly different, so it is very easy to get started. One difference relates to the icons in the main toolbar that control layout. These allow you to quickly change between a single file pane and as many as four panes. With one click you have multiple file explorers conveniently arranged side by side that work independently from each other. Browsing, copying, and moving files around is a breeze. The integrated thumbnail image viewer with multiple thumbnail layouts, slideshows, effects, and image processing provides most of what you require to browse and edit your image collection. Any file display can be viewed in this mode, allowing your images, video, or even slide shows to play along as you work on your files. If you like stats on your files such as size or type distributions, version 4 begins to incorporate file analysis features, viewable in a spreadsheet or charts. Renaming multiple files is a real pain in Windows. With One Cat File Manager you can make your changes to an entire set of files complete with a preview of how they will turn out. No more pattern-based "OOPS!" problems in the command line. Version 4 expands the renaming capabilities to include prefixes, suffixes, and procedural renaming. Procedural renaming provides the ability to rename files completely from scratch all at once according to various rule sets. Give it a try, its addictive!