What would happen if every tech support board asked you to put keywords about your question in before making the post, and then sending these keywords to google?
How can someone ask "how do I open 7z" after filling a request for porn? How?
And then !I! get bitched at for asking questions people can't answer, ahem /g/IRC.
Uninstall your winzip program before you install winrar. Because you won't need it anymore once you have installed winrar.
Winzip cannot open RAR files. But winrar can read zip, rar and other compressed extension.