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what is a zipx file

PeaZip is a free cross-platform file archiver utility that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX... free alternative to WinRar, WinZip and similar proprietary software.
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What is ZIPX file format, WinZip archives




zipx extension


ZIPX file extension designates, by definitionzipx file format definition, a ZIP file employing a compression method different than Deflate or Deflate64.
The extension was introduced by WinZip team, starting from WinZip 12.1 (released as trialware program on 13 September 2008), in order to differentiate files created with new compression algorithms from ZIP files compressed with classic Deflate algorithm - as legacy applications would be not able to read new files.

WinZip's ZIPX standard is based on PKZip's ZIP format specifications, with only difference of employing newer data compression algorithms - BZip2, LZMA, PPMd and others (superseding classic Deflate / Deflate64 algorithm) - and employing custom pre-compression filters (WavPack, MP3 and JPEG filter) to improve compression of images and other media data structures.
This results in zipx providing higher, improved compression ratio compared to classic zip/Deflate, at cost of higher computational cost, comparable with compression ratio of formats like RAR, ACE, and in some cases 7-Zip's 7Z / XZ files - modern archiving formats also relying in LZMA and PPMd -family compression algorithms and multimedia precompressors.

The possibility of employing alternate compression methods is anyway already featured in standard ZIP format definition, so using an alternate designation as ZIPX is merely a choice and does not (technically) define a different, independent standard.
File extension modification from zip to zipx was intended to avoid ambiguity with users (openly marking it as new type, with new extension) and prevent older archivers to try to handle the new zipx standard as it was a classic zip file, failing to support its newer features.

ZIPX files supports new AES-based WinZip's AE encryption (128 bit and 256 bit), which is also part of ZIP standard - and optionally, for legacy support only, old ZipCrypto (Zip 2.0) cryptography.
Like for ZIP files, WinZip provides its custom file spanning scheme for splitting ZIPX archives (Z01 extension).
As in current Zip format revision, Zipx format is limited to maximum 4 billion files per archive (2^32) and to 16 EB as max file size (2^64), either for the single input files and for the total size of the archive - as ZIP64 standard zip archives - likely exceeding user's needs and limits of current filesystems implementation.

PeaZip can create, open and extract ZIPX files with Bzip2, LZMA, LZMA2, and PPMd (technically ZIPX files by definition); custom WavPack, MP3 and JPEG pre-compression filters are currently unsupported (both for reading and for writing).
To add support to WavPack in PeaZip, you can use WavPack7zWavPack standard plugin (free of charge, closed source, hence cannot be provided with PeaZip packages), simply extracting the 32 or 64 bit plugin in PeaZip's folder, in \res\7z\Codecs path.

zipx file format

zipx format features


On data compression benchmark page you can compare how .zpix format fares, in terms of compression ration and compression / extraction computation speed, with mainstream formats such as .7z, .rar, and .zip, testing various software implementations (PeaZip, WinRar, WinZip).

External online resources about .zipx archives: ZIPXzipx file format Wikipedia page, WinZip.zipx type Knowledge Base entry for ZIPX standard.

  



  

.ZIPX

WinZip team, 2008
max 4 billion files per archive
16 EB maximum file size (archive, input files)

SPEED zipx compression features

Zipx format features average speed: using PPMd or LZMA compression algorithms rather than Deflate, speed is comparable with WinRar' RAR or 7-Zip's 7Z rather than with classic ZIP compression.







COMPRESSION RATIO zipx vs rar vs 7z

Zipx format features very good compression: PPMd, and LZMA algorithms (and use of WavPack and JPEG pre-compression filters) provides compression ratio comparable to RAR and 7Z formats, so the format offers a flexible solution for fast archiving / backup (Deflate) and powerful slower compression (PPMd, LZMA)

ADVANCED OPTIONS zipx specifications

Zipx features good advanded options, and it is designed to employ new AES-based WinZip AE encryption standard. It however lacks recovery records option available for competing RAR format.






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FAQ > Archive file types > What is ZIPX file extension

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