opening pz files

I’m trying to learn more about collisions so I’m looking at the Ball In Maze source code. A comment states “Check maze.egg and ball.egg and look for lines starting with .”

How do I open .egg.pz files?
read the 1st question

Thanks. That did the trick.
I went to the c prompt, changed to the directory with ball.egg.pz , and typed

punzip ball.egg.pz
which didn’t work.
punzip -o ball.egg ball.egg.pz

Is punzip included in the distribution for windows? If so, where to find it?