This video tutorial from shrederjoe shows how to easily extract .rar file's content using WinRar application.
To start, download and install WinRar application on your computer.
You can find it using any internet search engine.
Beware it's not freeware.
Once it's installed, run the program and open .rar file or folder in it.
Then create a new folder on your Desktop, with a random name.
From WinRar top menu choose Extract To option, and browse to location where your created empty folder is.
Extraction Path and option window will help you to find it and ajust extraction settings.
Click OK. The content will be extracted to your folder on Desktop.