What software is needed to put a game that is downloaded from the internet in parts together?

I recently downloaded a game that came in 6 parts from the internet...I don't know how to access and play the game. I was wondering if there is any software that would do this for me?What software is needed to put a game that is downloaded from the internet in parts together?
Download/install 7zip. Right click all the parts, 7zip %26gt; extract to, and let it run.