Files with the .zix extension are most commonly associated with the WinZix file archiving application. WinZix is used to compress large batches of files into a single compressed file archive. These files are saved with the .zix file extension.
The .zix file extension is also used for Quicken data files and Caml Light (camlc) debugger files.
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If you have additional information about the ZIX file format or software that uses files with the ZIX suffix, please do get in touch - we would love hearing from you.