ZIP
- Not to be confused with Zip disk, an unrelated disk cartridge unit.
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ZIP is one of the most popular file compression formats. It was created in 1989 as the native format of the PKZIP program, which was introduced by Phil Katz in the wake of a lawsuit (which he lost) against him by the makers of the then-popular ARC program (and file format) for copyright and trademark infringement in an earlier program PKARC which had been file-compatible with ARC. This resulted in Katz creating a new file format, which rapidly overtook ARC in popularity (to a large extent because of BBS sysops, then the primary users of such compression, resenting the lawsuit). Many programs have been released for a variety of operating systems to compress and decompress ZIP files, and native support for the format is built into several popular operating systems.
Identifiers
- File extension: .ZIP
- MIME type (Internet media type): application/zip
- Uniform Type Identifier (Apple): com.pkware.zip-archive
- PUID (PRONOM): x-fmt/263
References
- ZIP (file format): Wikipedia
- APPNOTE from PKWARE (latest version of formal spec)
- APPNOTE Archives from PKWARE (selected versions since 4.5.0 from 2001)
- IANA registration for application/zip in July 1993 (corresponds to version 2 of APPNOTE.TXT)
- Documentation from Info-ZIP (Includes Info-ZIP variants on APPNOTE.TXT dated from 1996 to 2004, specifications used as the basis for various open-source tools)
- ZIP File Format (PKWARE), from Library of Congress resource on Sustainability of Digital Formats
- ZIP Format summary at PRONOM
