Info-ZIP


UnZip 6.0

The Third Most Portable Program in the World! *

UnZip is an extraction utility for archives compressed in .zip format (also called "zipfiles"). Although highly compatible both with PKWARE's PKZIP and PKUNZIP utilities for MS-DOS and with Info-ZIP's own Zip program, our primary objectives have been portability and non-MSDOS functionality.

UnZip will list, test, or extract files from a .zip archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract into the current directory (and subdirectories below it) all files from the specified zipfile. A companion program, Zip, creates .zip archives; both programs are compatible with archives created by PKZIP and PKUNZIP for MS-DOS, but in many cases the program options or default behaviors differ. (For example, UnZip recreates the stored directory structure by default; PKUNZIP unpacks all files in the current directory by default.)

The Unix port of UnZip 5.52 is reported to have a race-condition vulnerability, whereby a local attacker could change the permissions of the user's files during unpacking. (This has been assigned CVE ID CAN-2005-2475.)

All versions of UnZip through 5.50 have a number of directory-traversal vulnerabilities, and version 5.50 also has a textmode data-corruption bug that affects 16-bit ports such as MS-DOS. See the FAQ page for details.

Contents of This Page:


Latest Release

New features in UnZip 6.0, released 20 April 2009:

For the UnZip 6.0 release, we want to give special credit to Myles Bennet, who started the job of supporting ZIP64 extensions and Large-File (> 2GiB) and provided a first (alpha-state) port.


Future Plans

The next major release will be version 6.1.

It is questionable whether there will ever be a subsequent major release, but on the off-chance that there is, it will probably be version 7.0, perhaps with a much-improved and unified DLL interface and possibly better file system support for the MVS and VM/CMS ports, assuming that doesn't happen sooner. And then perhaps version 8.0 will be released, with full filter support (that is, able to read and extract a zipfile from standard input like fUnZip does now), but now we're really dreaming. While we're at it, though, a tcl/tk or Python/PIL graphical interface might be nice--but see the related-links section for a pointer to TkZip, which already exists (and has for a long time).


Downloads

Ready-to-run binary versions of UnZip are available for numerous platforms and operating systems, but for most systems, only older binaries are available.

As of 2009, the latest sources and binaries for Zip, UnZip, WiZ and MacZip (including encryption code) are available at ftp.info-zip.org and Info-ZIP's SourceForge site.

Here's a quick guide to the directory structure of the ftp site:

Binaries for this OS... ...can be found in this directory
AmigaDOS AMIGA
AOS/VS AOSVS/beta
Atari TOS/MiNT ATARI
BeOS BEOS
FlexOS (IBM 4680 and 4690 point-of-sale terminals) FLEXOS
Human68K (X68000) HUMAN68K
Macintosh MACOS (also see Dirk Haase page)
MS-DOS / PC-DOS / DR-DOS / FreeDOS MSDOS
MVS ("OS/390 Base") / OS/390 OpenEdition MVS
Novell Netware NOVELL (also see HrZip and HrUnZip page)
OS/2 OS2
QDOS / SMSQ QDOS
RISC OS (e.g., Acorn Archimedes) RISCOS
Tandem NSK D30 (should also be OK on D20, D40) TANDEM (also see Info-ZIP for Tandem page)
Unix:
  AIX 3.2.5 through 5L UNIX/AIX
  CLIX (Intergraph) UNIX/CLIX
  ConvexOS UNIX/CONVEX
  Digital Unix (OSF/1, Compaq Tru64) / Ultrix UNIX/DEC
  FreeBSD UNIX/FREEBSD
  HP-UX (PA-RISC) / MPE/iX (HP 3000) UNIX/HP
  Linux UNIX/LINUX
  NetBSD ftp.netbsd.org
  QNX UNIX/QNX
  SCO Unix UNIX/SCO
  SGI Irix UNIX/SGI
  Solaris / SunOS UNIX/SUN
VM/CMS VMCMS
VMS VMS
Windows 3.x WIN16
Windows 9x / ME / NT / 2000 / XP / etc. WIN32
Windows CE 1.0 WINCE


Other Stuff

Technical information on zipfiles and other assorted Info-ZIP documentation is available from:

Technical information and documentation for deflate/inflate and zlib are available from:

Further information on where to (possibly) find Info-ZIP stuff is available in:

Information about commercial use, modification and redistribution of Zip, UnZip, WiZ and MacZip is available in:

It's basically BSD-like, but note that there may still be a few remaining files in some of the packages that are covered by different licenses.


[Info-ZIP] Return to the Info-ZIP Home Page.


Last updated 9-MAR-2017. Web page occasionally maintained by Hunter Goatley. Please direct Info-ZIP queries (availability, ports, bugs, etc.) to Zip-Bug .
* "Hello, world" would be the first, of course. C-Kermit is probably second. (The Linux kernel may very well be third...)
Copyright © 1995-2008 Greg Roelofs.
UnZip is maintained by Christian Spieler.