ZIPX is a compressed file format introduced with WinZip 12.1. It compresses files more efficiently than the previous .ZIP format. Zipped archives may contain one file or several files.
About Corel WinZip
WinZip is a popular file compression utility for Windows. It can be used to compress and decompress file archives in many different formats and can create split archives. WinZip supports the "ZIPX" format and also supports image compression. The program can also encrypt files with AES encryption to protect sensitive data.