Here's the case study on How to extract a rar file ..
http://howgeeky.com/how-to-extract-files
Steps that are needed to extract a rar file are :
1. Download software (winrar in this case)
2.install it.
3.Open your file
All you have to do to extract a file is download and install winrar and then open your desired file.
Download link for winrar :
According to system type : http://www.rarlab.com/download.htm
Or
http://winrar.en.softonic.com/download
Hope this video helped everyone ...