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Go to the location of the ZIP file that you want to open. Since ZIP files store regular files and folders in a compressed format, you'll need to extract the ZIP file in order to use properly the stored files and folders. This will prompt the ZIP file to begin extracting automatically. It can take anywhere from a few seconds to several minutes for your ZIP file to finish extracting. By default, the extracted ZIP folder—which is just a regular folder with the same name as the ZIP folder—will open as soon as the extraction is complete. If it doesn't, double-click the extracted folder to open it like usual. Once you've extracted the ZIP folder, you can use the files inside of the extracted folder like you usually would.
Find the ZIP file. Double-click the ZIP file. Allow the ZIP file to finish extracting. Open the extracted folder if necessary.