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6.3.3: (2012) Document formatting changes to facilitate referencing the PKWARE Application Note from other standards using methods such as the JTC 1 Referencing Explanatory Report (RER) as directed by JTC 1/SC 34 N 1621.6.3.2: (2007) Documented compression method 97 ( WavPack).Expanded list of supported compression algorithms ( LZMA, PPMd+), encryption algorithms ( Blowfish, Twofish), and hashes. 6.3.0: (2006) Documented Unicode ( UTF-8) filename storage.6.2.0: (2004) Documented Central Directory Encryption.6.1: (2004) Documented certificate storage.5.2: (2003) AES encryption support for SES (defined in APPNOTE 5.1 that was not published online) and AES from WinZip ('AE-x') corrected version of RC2-64 supported for SES encryption.5.0: (2002) SES: DES, Triple DES, RC2, RC4 supported for encryption (not published online until the publication of APPNOTE 5.2).4.6: (2001) BZIP2 compression (not published online until the publication of APPNOTE 5.2).

2.0: (1993) File entries can be compressed with DEFLATE and use traditional PKWARE encryption (ZipCrypto).

The URL of the online specification was changed several times on the PKWARE website.Р”Р„ summary of key advances in various versions of the PKWARE specification: Specifications of some features such as BZIP2 compression, strong encryption specification and others were published by PKWARE a few years after their creation. Several versions of the specification were not published.

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ZIP File Format Specification' and it is published on the website since the late 1990s. ZIP file format specification is formally named 'APPNOTE. Other companies or organizations support the PKWARE specifications at their own pace. At various times, PKWARE has added preliminary features that allow PKZIP products to extract archives using advanced features, but PKZIP products that create such archives are not made available until the next major release. ZIP File Format Specification has its own version number, which does not necessarily correspond to the version numbers for the PKZIP tool, especially with PKZIP 6 or later. PKWARE and Infinity Design Concepts made a joint press release on February 14, 1989, releasing the. By distributing the zip file format within APPNOTE.TXT, compatibility with the zip file format proliferated widely on the public Internet during the 1990s. ZIP File Format Specification was first published as part of PKZIP 0.9 package under the file APPNOTE.TXT in 1989. They wanted to imply that their product would be faster than ARC and other compression formats of the time. The name 'zip' (meaning 'move at high speed') was suggested by Katz's friend, Robert Mahoney. The format was created after Systems Enhancement Associates (SEA) filed a lawsuit against PKWARE claiming that the latter's archiving products, named PKARC, were derivatives of SEA's ARC archiving system. ZIP file format was designed by Phil Katz of PKWARE and Gary Conway of Infinity Design Concepts.

2.6 Combination with other file formats.

2.2.4 End of central directory record (EOCD).

When navigating a file system via a user interface, graphical icons representing ZIP files often appear as a document or other object prominently featuring a zipper. ZIP is used as a base file format by many programs, usually under a different name.

ZIP and the MIME media type application/zip. ZIP files generally use the file extensions.

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Most free operating systems have built in support for ZIP in similar manners to Windows and Mac OS X.

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Apple has included built-in ZIP support in MacР’В OSР’В X 10.3 (via BOMArchiveHelper, now Archive Utility) and later. Microsoft has included built-in ZIP support (under the name 'compressed folders') in versions of Microsoft Windows since 2000 (Windows Me).

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The ZIP format was then quickly supported by many software utilities other than PKZIP.

This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC compression format by Thom Henderson. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common. A ZIP file may contain one or more files or directories that may have been compressed. ZIP is an archive file format that supports lossless data compression.