Download WinZip for Mac now from Softonic: 100% safe and virus free.It can backup your data and reduce the size of. Before you can use these files, you must learn how to unzip files on mac computers for proper access – luckily the process isn’t that complicated! zip (a common standard used in OS X and Windows) and. You can easily identify compressed files by their extensions, such as. Files you download from the Internet are often compressed or zipped so that they take up less space and arrive much faster than files that haven’t been compressed.