Winrar has a free trial, John, it's free, it's only not free if you buy it.

Don't know why the EULA would have anything in it about it not being free...
Now I use 7zip, because it runs with everything, except for .Arj files and .ace. I think.
Also, unless it's a self extracting zip based exe, I don't think 7zip could let you look inside it.