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  2. List of archive formats - Wikipedia

    en.wikipedia.org/wiki/List_of_archive_formats

    A file which was "squeezed" had the middle initial of the name changed to "Q", so that a squeezed text file would end with .TQT, a squeezed executable would end with .CQM or .EQE. Typically used with .LBR archives, either by storing the squeezed files in the archive, or by storing the files decompressed and then compressing the archive, which ...

  3. ZIP (file format) - Wikipedia

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

    The .ZIP file format was designed by Phil Katz of PKWARE and Gary Conway of Infinity Design Concepts. 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. [3]

  4. 7-Zip - Wikipedia

    en.wikipedia.org/wiki/7-Zip

    The file manager has a toolbar with options to create an archive, extract an archive, test an archive to detect errors, copy, move, and delete files, and open a file properties menu exclusive to 7-Zip. The file manager, by default, displays hidden files because it does not follow Windows Explorer's policies.

  5. Solid compression - Wikipedia

    en.wikipedia.org/wiki/Solid_compression

    On newer formats such as 7-zip, there is a solid block size option that allows for the concatenated data block to be split into individually-compressed smaller blocks, so that only a limited amount of data in the block must be processed in order to extract one file. Parameters control the maximum solid block window size, the number of files in ...

  6. Executable compression - Wikipedia

    en.wikipedia.org/wiki/Executable_compression

    Software distributors use executable compression for a variety of reasons, primarily to reduce the secondary storage requirements of their software; as executable compressors are specifically designed to compress executable code, they often achieve better compression ratio than standard data compression facilities such as gzip, zip or bzip2 [citation needed].

  7. Talk:ZIP (file format) - Wikipedia

    en.wikipedia.org/wiki/Talk:Zip_(file_format)

    ZIP files themselves are not very operating-system specific. It's whether the software to compress and uncompress them is supported on an operating system. The first PKZip version which supported "flate" compression was released before Windows 3.1, when most X86 computers were still running MS-DOS.

  8. Lossy compression - Wikipedia

    en.wikipedia.org/wiki/Lossy_compression

    An important caveat about lossy compression (formally transcoding), is that editing lossily compressed files causes digital generation loss from the re-encoding. This can be avoided by only producing lossy files from (lossless) originals and only editing (copies of) original files, such as images in raw image format instead of JPEG. If data ...

  9. Lossless compression - Wikipedia

    en.wikipedia.org/wiki/Lossless_compression

    An obvious way of detection is applying a raw compression algorithm and testing if its output is smaller than its input. Sometimes, detection is made by heuristics; for example, a compression application may consider files whose names end in ".zip", ".arj" or ".lha" uncompressible without any more sophisticated detection. A common way of ...

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