Did you try to open .RAR file using Winzip?
It will not support - because of incompatibility issues.
Winzip is against RAR archiver.
How to extract files from any kind of archive?
Is there any free tool to help us?
Here is the solution. Please use Universal Extract.
Universal Extractor is a program do to exactly what it says: extract files from any type of archive, whether it's a simple zip file, an installation program, or even a Windows Installer (.MSI) package. This is still a work in progress , but so far it's proven quite useful.
Click Here to get it : http://www.legroom.net/software/uniextract#download