.rar is a file compression scheme like .zip.

You can do a websearch to find programs that will open them up if doubleclicking on the icon does nothing with your OS installation.

Performing the .rar to full file operation does not install the files, it just uncompresses them to whatever is inside the whole folder. From there you should see filenames and perhaps a readme file. Good idea to check the readme file before proceeding, for they typically contain directions.


--Mac