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These archives could optionally be passed through a stream compressor utility, such as compress and others. Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for 'Archived by Robert Jung'. The development of PKZIP was first announced in the file SOFTDEV.DOC from within the PKPAK 3.61 package, stating it would develop a new and yet unnamed compression program. The announcement had been made following the lawsuit between SEA and PKWARE, Inc. Although SEA won the suit, it lost the compression war, as the user base migrated to PKZIP as the compressor of choice. Led by BBS sysops who refused to accept or offer files compressed as. ARC files, users began recompressing any old archives that were currently stored in.

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The first version was released in 1989, as a DOS command-line tool, distributed under shareware model with a US$25 registration fee (US$47 with manual).

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Version history PKZIP PKZIP on a floppy disk #Pkware zip reader download registration PKZIP 0.8 (released on January 1, 1989) initial version.PKZIP 0.9 (released on February 10, 1989) supported reducing algorithm (from SCRNCH by Graeme McRae) with four compression settings and shrinking.

In addition to PKZIP and PKUNZIP, it also included ZIP2EXE, which required an external self-extracting executable header created by MAKESFX from the PKZIP executable package.

PKZIP 0.92 (released on March 6, 1989): In addition to bug fixes, PKZIP included an option to automatically choose the best compression method for each file.

New tools included with PKZIP include PKZipFix.

PKZIP 1.01 (released on July 21, 1989) added Implode compression, while reduced files can only be extracted from ZIP archive.

Imploding was chosen based on the characteristics of the file being compressed. New utility included Thomas Atkinson's REZIP conversion utility (part of ZIP-KIT). PKZIP's default compression behavior was changed from fastest (Shrink) to best (Implode).

PKZIP 1.02 (released on October 1, 1989) includes new utility BIOSFIX.COM, which preserved the entire 80386 register set during any mode switches via INT 15H.

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OS/2 version added ZIP2EXE and 2 self-extracting archive headers.

PKZIP 1.10 (released on March 15, 1990): New features included authenticity verification, 'mini' PKSFX self-extracting module, integrating self-extracting module into ZIP2EXE, ability to save & restore volume labels.

Imploding was up to 5X faster and compression ratio was improved over 1.02. EAX register was always saved on 80386 or above CPU. Removed tools included BIOSFIX, REZIP, MAKESFX.

PKZIP 1.93a (released in October 1991): An alpha version that introduced a new compression method which Katz called ' deflating'.

It was supposed to be quickly followed by a final PKZIP 2 release, but there were numerous delays.

PKZIP 2.04g (released in January 1993): By the time the release was ready, fake 2.x releases were circulating, some of them malware, so an untainted version number was chosen instead of 2.0.

This new version dispensed with the miscellaneous compression methods of PKZIP 1.x and replaced them with the deflate algorithm (although several levels of deflation were provided by the program). The resulting file format has since become ubiquitous on Microsoft Windows and on the Internet вЂ“ almost all files with the. zip) extension are in PKZIP 2.x format, and utilities to read and write these files are available on all common platforms. PKZIP 2.x also supported spanning archives to multiple disk, which simply split the files into multiple pieces, and using volume label on each drive to differentiate each other.

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#Pkware zip reader download verificationДЄ new Authenticity Verification (AV) signature format was used. Registered version included PKUNZJR, PK Safe ANSI, PKCFG utilities. It was a version of PKZIP 2.04g licensed to IBM. #Pkware zip reader download verification.#Pkware zip reader download registration.