OS/2 version added ZIP2EXE and 2 self-extracting archive headers. 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.PKZIP's default compression behavior was changed from fastest (Shrink) to best (Implode). New utility included Thomas Atkinson's REZIP conversion utility (part of ZIP-KIT). Imploding was chosen based on the characteristics of the file being compressed. PKZIP 1.01 (released on July 21, 1989) added Implode compression, while reduced files can only be extracted from ZIP archive.New tools included with PKZIP include PKZipFix. 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.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 0.9 (released on February 10, 1989) supported reducing algorithm (from SCRNCH by Graeme McRae) with four compression settings and shrinking.PKZIP 0.8 (released on January 1, 1989) initial version.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). ARC files, users began recompressing any old archives that were currently stored in. Led by BBS sysops who refused to accept or offer files compressed as. Although SEA won the suit, it lost the compression war, as the user base migrated to PKZIP as the compressor of choice. The announcement had been made following the lawsuit between SEA and PKWARE, Inc. 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. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for 'Archived by Robert Jung'. Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. These archives could optionally be passed through a stream compressor utility, such as compress and others. These utilities were designed to gather a number of separate files into a single archive file for easier copying and distribution. They include the Unix utilities ar, shar, and tar. By the 1970s, file archiving programs were distributed as standard utilities with operating systems.

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