Editing List of archive formats (section)

=== Compression only ===
{| class="wikitable"
|-
![[File extension]](s){{efn|name="file extensions"}}
![[MIME]] type{{efn|name="MIME type"}}
!Official name{{efn|name="official name"}}
!Platform{{efn|name="platform"}}
!Description
|-
|.br
| application/{{nowrap|x-brotli}}
|[[Brotli]]
|all
|Brotli is a compression algorithm developed by Google for textual web content, and typically achieves higher compression ratios than other algorithms for this use case.
|-
|.bz2
| application/{{nowrap|x-bzip2}}
|[[bzip2]]
|Unix-like
|An [[Open-source license|open source]], [[patent]]- and [[Royalties|royalty]]-free compression format. The compression algorithm is a [[Burrows–Wheeler transform]] followed by a [[move-to-front transform]] and finally [[Huffman coding]].
|-
|.F, .?XF{{efn|name="freeze_xf"|If attaching <code>.F</code> to the file name is not possible with the DOS operating system, the second and third character of the filename extension are replaced by <code>XF</code>.}}
|
|{{anchor|freeze_command}}Freeze/melt<ref>{{Cite web |url=http://www.ibiblio.org/pub/Linux/utils/compress/freeze-2.5.0.tar.gz |title=Archived copy |access-date=2009-03-05 |archive-date=2022-02-01 |archive-url=https://web.archive.org/web/20220201133941/http://www.ibiblio.org/pub/Linux/utils/compress/freeze-2.5.0.tar.gz |url-status=live }}</ref>
|[[QNX]]4, [[Unix-like]] and [[DOS]]
|Old compressor for QNX4 OS. The compression algorithm is a modified [[LZSS]], with an adaptive [[Huffman coding]].
|-
|.genozip
| application/{{nowrap|vnd.genozip}}
|[[genozip]]
|Linux, macOS, Windows
|Genozip, a compressor for genomic file formats such as FASTQ, BAM, VCF and others.<ref>{{Cite web|url=https://academic.oup.com/bioinformatics/article/37/16/2225/6135077|title=Genozip - A Universal Extensible Genomic Data Compressor|access-date=2022-12-26|archive-date=2022-12-26|archive-url=https://web.archive.org/web/20221226173120/https://academic.oup.com/bioinformatics/article/37/16/2225/6135077|url-status=live}}</ref>
|-
|-
|.gz
| application/{{nowrap|gzip<ref>{{cite IETF|title=The 'application/zlib' and 'application/gzip' Media Types|rfc=6713|access-date=2016-05-03}}</ref>}}
|[[gzip]]
|Unix-like
|[[GNU]] Zip, the primary compression format used by [[Unix-like]] systems. The compression algorithm is [[Deflate]], which combines [[LZSS]] with [[Huffman coding]].
|-
|.lz
| application/{{nowrap|x-lzip}}
|[[lzip]]
|Unix-like
|An alternate [[LZMA]] algorithm implementation, with support for checksums and ident bytes.
|-
|.lz4
|
|[[LZ4 (compression algorithm)|LZ4]]
|Unix-like
|Algorithm developed by Yann Collet, designed for very high (de)compression speeds. It is an [[LZ77]] derivative, without [[entropy encoding]].
|-
|.lzma
| application/{{nowrap|x-lzma}}
|[[LZMA|lzma]]
|Unix-like
|The [[LZMA]] compression algorithm as used by [[7-Zip]].
|-
|.lzo
| application/{{nowrap|x-lzop}}
|[[lzop]]
|Unix-like
|An implementation of the [[Lempel–Ziv–Oberhumer|LZO]] data compression algorithm.
|-
|.rz
|
|[[rzip]]
|Unix-like
|A compression program designed to do particularly well on very large files containing long distance redundancy.
|-
|.sfark
|
|[[sfArk]]
|[[Microsoft Windows|Windows]] compress/decompress- [[Linux]] and [[macOS]] decompress only
|A compression program designed to do high compression on SF2 files ([[SoundFont]]).
|-
|.sz
| application/{{nowrap|x-snappy-framed}}
|[[Snappy (compression)|Snappy]]
|Unix-like
|A compression format developed by [[Google]], and open-sourced in 2011. [[Snappy (compression)|Snappy]] aims for very high speeds, reasonable compression, and maximum stability rather than maximum compression or compatibility with any other compression library. It is an [[LZ77]] derivative, without [[entropy encoding]].
|-
|.?Q?
|
|[[SQ (program)|SQ]]
|[[CP/M]] and [[DOS]]
|Squeeze: A program which compressed files using [[Huffman coding]].  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 would have a name ending in ".LQR".
|-
|.?Z?
|
|[[CRUNCH (program)|CRUNCH]]
|[[CP/M]] and [[DOS]]
|A compression program written by Steven Greenberg<!-- not any Steven Greenberg currently in wikipedia --> implementing the LZW algorithm. For several years in the CP/M world when no implementation was available of ARC, CRUNCHed files stored in .LBR archives were very popular. CRUNCH's implementation of LZW had a somewhat unusual feature of modifying and occasionally clearing the code table in memory when it became full, resulting in a few percent better compression on many files.
|-
|.xz
| application/{{nowrap|x-xz}}
|[[XZ Utils|xz]]
|Unix-like
|A compression format using [[LZMA2]] to yield high compression ratios. The LZMA algorithm is an [[LZ77]] derivative, with [[entropy encoding]] in the form of [[range encoding]].
|-
|.z
| application/{{nowrap|x-compress}}
|[[pack (compression)|pack]]
|Unix-like
|The traditional [[Huffman coding]] compression format.
|-
|.Z
| application/{{nowrap|x-compress}}
|[[compress]]
|Unix-like
|The traditional [[LZW]] compression format.
|-
|.zst
| application/{{nowrap|zstd}}
|[[Zstandard]]
|[[Cross-platform]]
|Algorithm developed by Yann Collet at [[Facebook]], combining high speed and high compression. It is an [[LZ77]] derivative, with [[entropy encoding]] in the form of [[finite-state entropy]] and [[Huffman coding]].
|-
|.??_
|
|
|MS-DOS/Windows
|Compression format(s) used by some DOS and Windows install programs. MS-DOS includes expand.exe to decompress its install files.  The compressed files are created with a matching compress.exe command. The compression algorithm is [[LZSS]].
|}