ZIP files hold several compressed files inside, reducing how much space they take on your hard drive. They need to be unzipped to use the files, though. Here's how to do it.

Click "WinZip" and select "Extract To" to open WinZip's Extract window, which displays the folders on your hard drive. Double-click on the folder into which you want to extract the RAR file.

Therecipient will get the files zipped together, and can unzip themeither using Windows built-in unzipping capabilities, or add-onsoftware like WinZip. This Outlook plug-in does more as well.