Some of the critical advances in the ZIP file format specification include:ġ993 – Version 2.0 allowed file entries to be compressed using DEFLATE as well as make use of PKWARE encryption.ġ996 – Deflate64 compression was introduced to the file format.Ģ001 – The 64 bit ZIP format was documented for the first time.Ģ002 – Support for Triple DES, DES, RC4, and RC2 incorporated into the file format (not published until later).Ģ003 – Support for AES encryption and a corrected version of RC2-64 encryption included in the file format.Ģ004 – Certificate storage and Central Directory Encryption documented for the first time.Ģ006 – Included support for UTF-8 filename storage. ZIP File Format Specification” and continues to be published on the website.

The formal name of the Zip file specification is, “APPNOTE –. The Zip file has a format specification with its own version number that is no longer tied to the versioning of the PKZIP tool. Zip files are designated by the MIME media type application/zip and normally appear visually as a file or document with a zipper icon.

The file format was first implemented in the PKZIP utility and was designed as a replacement for the ARC compression format. The format allows several different compression algorithms to be used for creating file archives and was originally created in 1989 by Phil Katz. What is the Zip File Format?Ī zip file is an archive file format that provides support for lossless data compression of one or more files or folders.

Despite this added functionality, a common question that arises amongst Mac users is how to zip files on a Mac. Mac users however, did not enjoy this “built-in” support for the file format until Mac OS X 10.3 when the Archive Utility was added to the operating system. The format has been supported via third party utility since its creation and has seen built-in support in the Windows and Mac OS X operating systems added over the past several years. The zip file format has been around since the late 1980s and provides computer users with the ability to compress one to many files.

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