A .zip file is a commonly used file format that compresses files to make them easier to download. There are many programs available online that allow you to unzip/extract these files, some are trial based or require a purchase and others are free. Most every device comes with a free way to access your files that are "zipped". In Windows, right mouse click over the .zip file and you should have options to "extract" the file. On a Mac, doubleclick over the .zip file. Take care where you are extracting the file. As you "unzip" a file, you will be given an option of where you want to store it.