I've been using Directory Opus since v8. It's a file manager for Windows. Absolutely brilliant software with amazing options to customise. And the author is Australian so good to support him. Just received an e-mail giving 40% off.
Information (from the home page):
Welcome to Directory Opus!
Are you frustrated by the limitations of Windows Explorer? Directory Opus is a complete replacement for Explorer, with far more power and functionality than any other file manager available today.
Single or dual pane file display and folder trees
Tabbed interface let you keep multiple folders open and switch quickly between them
Unique Explorer Replacement mode provides a full replacement for Windows Explorer
Quickly filter, sort, group and search your folders
Color-code your files, assign status icons, star ratings, tags and descriptions
View images, documents and more. Image marking lets you sort your photos quickly and easily
Batch renaming including easy-to-use keyboard macros
View and edit file metadata
Support for FTP and archive formats like Zip, 7Zip and RAR
Built-in tools including synchronize and duplicate file finder
Calculate folder sizes and print or export folder listings
Queue multiple file copies for improved performance
Fully configurable user interface - colors, fonts, toolbars, keyboard hotkeys, and a full scripting interface let you tailor Opus exactly to suit your needs
Efficient, multi-threaded, modern design. Supports the latest 4K monitors. Available in both 32 and 64 bit versions.
The only software I missed when I switched to linux. Dopus is great, support Aussie developers.