Open a ZIP file on a Mac OS X system by extracting the archive in Finder or via a third-part application from the Mac App Store, such as RAR Extractor Free. Finder can also re-zip the extracted files.
Although it's not available in the Applications folder, Mac OS X features the Archive Utility app. Capable of opening ZIP files, the application allows Finder to use its features. To open a ZIP file in Finder, double-click the file, and wait for Finder to decompress it. If the ZIP archive contains a single file, this file has the same name as the original ZIP file. If there are multiple compressed files, Finder puts them in a folder with the same name as the ZIP file.
After installing RAR Extractor Free, the application replaces the double-click ZIP extraction function in Finder. As such, you can open a ZIP file via RAR Extractor Free by simply double-clicking it. Alternatively, you can put the application on the dock and drag ZIP files onto it.
To put the files back into a ZIP archive, select the ones you want to include, right-click any of them, and click Compress from the menu. Once the compression process completes, the ZIP file appears in the same folder as the original files.