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Pkware appnote zip file#
Pkware appnote archive#
Pkware appnote software#

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

The URL of the online specification was changed several times on the PKWARE website.Ī 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.

Pkware appnote zip file#

ZIP File Format Specification" and it is published on the website since the late 1990s. The 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. The zip file format was released into the public domain, but some ZIP features are covered by patents or pending patents. 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. He created the format after his company had lawsuits filed against him by Systems Enhancement Associates (SEA) claiming that his archiving products were derivatives of SEA's ARC archiving system. The zip file format was created by Phil Katz of PKWARE.

2.6 Combination with other file formats.

Zip files are often represented by 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 files generally use the file extensions ".zip" or ".ZIP" and the MIME media type application/zip.

Pkware appnote archive#

Apple has included built-in zip support in Mac OS X 10.3 (via BOMArchiveHelper, now Archive Utility) and later, along with other compression formats. Microsoft has included built-in zip support (under the name "compressed folders") in versions of Microsoft Windows since 1998.

Pkware appnote software#

The zip format is now supported by many software utilities other than PKZIP. The format was originally created in 1989 by Phil Katz, and was first implemented in PKWARE'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. A zip file contains one or more files that have been compressed, to reduce file size, or stored as is. Zip is a file format used for data compression and archiving.

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