How do you know when a file is unzipped?
If you use an utility such as 'Winzip', then once the file(s) are unzipped it will show you the the folder they are in. And with most zip files programs you have to indicate a destination folder before you can unzip anyway. I find 'Winzip' is It great and you can dowload it for free to evaluate it. It has a wizard feature menu which is very simple to use.