Files with the .zipx extension are compressed ZIP Extended files.
The ZIPX format was introduced with WinZip version 12.1. Prior to version 12.1 the application assigned the .zip file extension.
The ZIPX file format introduced four new compression algorithms (ways of reduzing file sizes) to the ZIP file format, which is why Corel Inc. after pressure from users and competitors, decided to name the files ZIPX rather then ZIP, as the first version of WinZip that used the new algorithms broke compatibility with other ZIP compression tools.
Today most modern compression tools support the ZIPX, like e.g. BitZipper.
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