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2. ZIP (file format) - Wikipedia

   en.wikipedia.org/wiki/ZIP_(file_format)

   The format of the Local file header (LOC) and Central directory file header (CDFH) are the same in ZIP and ZIP64. However, ZIP64 specifies an extra field that may be added to those records at the discretion of the compressor, whose purpose is to store values that do not fit in the classic LOC or CDFH records.

3. ALZip - Wikipedia

   en.wikipedia.org/wiki/ALZip

   ALZip is an archive and compression utility software application from ESTsoft for Microsoft Windows that can unzip 40 different zip file archives. ALZip can zip files into eight different archive formats such as ZIP, EGG, TAR, and others. Introduced in ALZip version 8, the EGG archive format can be used, which supports Unicode and other features.

4. Magic number (programming) - Wikipedia

   en.wikipedia.org/wiki/Magic_number_(programming)

   Headers in ZIP files often show up in text editors as "PK♥♦" (50 4B 03 04), where "PK" are the initials of Phil Katz, author of DOS compression utility PKZIP. Headers in 7z files begin with "7z" (full magic number: 37 7A BC AF 27 1C ).

5. 7z - Wikipedia

   en.wikipedia.org/wiki/7z

   7z is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms. The 7z format initially appeared as implemented by the 7-Zip archiver. The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License.

6. Self-extracting archive - Wikipedia

   en.wikipedia.org/wiki/Self-extracting_archive

   A single file format, such as 7z, can support multiple different compression algorithms, including LZMA, LZMA2, PPMd, and BZip2. [citation needed] Decompression utilities must be able to handle both the file format and the algorithm used when expanding self-extracting or standard archives. Depending on the options used to create a self ...

7. 7-Zip - Wikipedia

   en.wikipedia.org/wiki/7-Zip

   7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z introduced in 2001, [12] but can read and write several others.

8. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   A package format to enable distribution of applications and libraries by bundling many PHP code files and other resources (e.g. images, stylesheets, etc.) into a single archive file .pim PIM Windows: Windows: Yes The format from the PIM - a freeware compression tool by Ilia Muraviev.

9. PKZIP - Wikipedia

   en.wikipedia.org/wiki/PKZIP

   Led by some BBS sysops who refused to accept or offer files compressed as .ARC files, users began recompressing any old archives that were currently stored in .ARC format into .ZIP files. 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).