Once you’ve downloaded and installed 7-Zip from their web site, you can right-click on any .RAR file and easily choose to extract the files from the menu. Note that if you’ve got a multi-part set of .RAR files, you’ll want to click on the first file.
You can also view the contents of the archived file by either choosing open archive from the context menu or by double clicking on the file.
There’s a lot of other applications that support extraction of .RAR files, but because 7-Zip is open source and free, it’s our default choice.
In Mac OSX there are not as many choices as on the more popular Windows platform, however there are still a few choices, like the free app “The Unarchiver“, which has great support for multi-part archive files. Once installed, you can launch the app to associate file types with the app:
The way to extract your archives on a Mac is to simply double-click on the file. The Unarchiver will create a folder with the same name as the archive and extract its contents into the folder.