I looked up WinZip, you can get a free trial and it only costs $29.95. I think that is the most user friendly and most common, so it should be compatible with the files you mentioned.
I thought XP comes with it's own unzipping program. I had to unzip a program last nite. I just clicked on the program & it unzipped itself. In the past, I've used Winzip.
Make sure you run an antivirus before unzipping any program you're not sure of where you're getting it from.
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