Winrar is a utility for zipping and unzipping files, and I think the only zip utility which allows you to change the theme too. You only need to download any of the themes, open options in Winrar, and change your theme.
13 Winrar Themes you should download and try
WinRAR Smile theme version
WinRAR Jr. theme
WinRAR Orbital theme
WinRAR GANT theme
WinRAR JOM theme
Delato theme
WinRAR Gorilla
WinRAR Noia Bogart
WinRAR Buuf theme
WinRAR Last Order
GnomeRAR theme
You can download all the files listed on this page of rarlab. Themes are available in 32 x 32, 48 X 48, 64 X 64, 80 X 80, 96 X 90 toolbar icons sets and read our excellent post on How to use Winrar effectively – 7 tips and How to create a professional installer using Winrar!
