If you go to "Help" and select "About WinRaR" and click on the WinRaR logo you can watch the ocean surf and waves move. If you then "Shift-Click" on the logo you can see a sailboat just above the "R" sailing around in the water. I have done this several...
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1. Select Help
2. Select About WinRAR
3. Just click on the books and they will fall down!
4. Enjoy!