Files that contain the .isz file extension normally store compressed disk image files. ISZ files are very similar in nature to ISO files, but the contents of an ISZ file are compressed in order to make the file smaller and save disk space.
The ISZ file format also supports password protection and encryption. Very large ISZ files may be split into separate volumes. The smaller file sizes of the split archive make it easier for users to distribute the files over the Internet.
The ISZ file format was created by EZB Systems, the same software company that created the UltraISO software application.
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If you have additional information about the ISZ file format or software that uses files with the ISZ suffix, please do get in touch - we would love hearing from you.