If you right-click on the file in Windows Explorer and select "Open With..." and then on the menu that comes out, if Winzip isn't on there, select the "Choose program" link, and browse to Winzip. Put a check in "Always use this program to open these types of files."

Alternatively, run Winzip from the start menu and go to Options>Configuration. Go to the System tab and in the top left area click on the "Associations" button. Select .RAR files then click ok. (Or just select everything.)

Note - these instructions are for Winzip 11 - you may need to download the latest version if you're using an older one.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire