A Zipx file (.zipx) is a Zip file created using WinZip's advanced compression methods. By using the most recent compression methods to create Zipx files, WinZip 12.1 and later creates WinZip's smallest Zip files to date.
The .zipx extension makes it easier to share highly compressed files with others by making it clear that the file was created using an advanced compression method and that WinZip 12.1 or later (or another compatible compression utility) is required to open the file.
Of course users can also still create Legacy Zip 2.0 compressed files with WinZip (resulting in a .zip file extension) by changing the compression method on a case by case basis or by changing the default compression method.
