7-Zip: an efficient free open source file compression and decompression tool

Updated Logs

Ref：History of 7-zip changes

The original copyright belongs to the original author.

24.09 - 2024-11-29

• The default dictionary size values for LZMA/LZMA2 compression methods were increased:

  dictionary size   compression level
  v24.08  v24.09  v24.09
          32-bit  64-bit
  8 MB     16 MB   16 MB   -mx4
  16 MB    32 MB   32 MB   -mx5 : Normal
  32 MB    64 MB   64 MB   -mx6
  32 MB    64 MB  128 MB   -mx7 : Maximum
  64 MB    64 MB  256 MB   -mx8
  64 MB    64 MB  256 MB   -mx9 : Ultra
          

  The default dictionary size values for 32-bit versions of LZMA/LZMA2 don't exceed 64 MB.
• 7-Zip now can calculate the following hash checksums: SHA-512, SHA-384, SHA3-256, and MD5.
• APM and HFS support was improved.
• If an archive update operation uses a temporary archive folder and the archive is moved to the destination folder, 7-Zip shows the progress of moving the archive file, as this operation can take a long time if the archive is large.
• Fixed a bug where 7-Zip File Manager didn't propagate Zone.Identifier stream for extracted files from nested archives.
• Some bugs were fixed.

24.08 - 2024-08-11

• Fixed a bug in 7-Zip 24.00-24.07 where creating a zip archive could write extra zero bytes after the end of the archive.
• Fixed a bug where there was a leak of GDI objects in the "Confirm File Replace" window, causing issues after 1600 displays.
• Optimizations for displaying file icons in 7-Zip File Manager and in "Confirm File Replace" window.
• Some bugs were fixed. CVE-2024-11612.

24.07 - 2024-06-19

• Fixed a bug where 7-Zip could crash for some incorrect ZSTD archives (CVE-2024-11477).

24.06 - 2024-05-26

• Fixed a bug where 7-Zip could not unpack some ZSTD archives.

24.05 - 2024-05-14

• New switch -myv={MMNN} to set decoder compatibility version for 7z archive creation.
• New switches -myfa={FilterID} and -myfd={FilterID} to allow or disallow specific filter methods for 7z archive creation.
• Some bugs were fixed.

24.04 - 2024-04-05

• Added new menu item in 7-Zip File Manager: "Tools / Delete Temporary Files...".

24.03 - 2024-03-23

• 7-Zip now supports the new RISCV filter for compression to 7z and xz archives.
• Improved LZMA and LZMA2 decompression speed in ARM64 version for Windows by 20%-60%.
• 7-Zip GUI and File Manager can request user permission to unpack RAR archives requiring large memory.
• Added new switches -smemx{size}g, -y, -slmu, and -slsl.
• 7-Zip supports .sha256 files with backslash path separators.
• Some bugs were fixed.

24.01 - 2024-01-31

• 7-Zip now can unpack ZSTD archives (.zst filename extension).
• 7-Zip now can unpack ZIP, SquashFS, and RPM archives that use the ZSTD compression method.
• Added support for the fast hash algorithm XXH64, used in ZSTD.
• 7-Zip now can unpack RAR archives (with dictionaries larger than 4 GB) created by WinRAR 7.00.
• Added support for unpacking DMG archives using XZ (ULMO/LZMA) compression method.
• Added support for unpacking NTFS images with cluster sizes larger than 64 KB.
• Added support for unpacking MBR and GPT images with 4 KB sectors.
• Speed optimizations for unpacking RAR, CAB, WIM, ZIP, and GZ archives.
• Speed optimizations for hash calculations: CRC-32, CRC-64, and BLAKE2sp.
• Fixed a bug in 7-Zip for Linux where multivolume creation could fail in some cases.
• Some bugs were fixed.

23.01 - 2023-06-20

• The "Language" page in 7-Zip's menu Tools/Options now shows information about the selected translation, including the number of translated lines.
• Some bugs were fixed.

23.00 - 2023-05-07

• 7-Zip now supports a new ARM64 filter for compression to 7z and xz archives, improving compression ratios for ARM64 (AArch64) executable files.
• Now parses executable files before compressing to select appropriate filters:
  • BCJ or BCJ2 for x86 executables.
  • ARM64 filter for ARM64 executables.
• Default BCJ2 filter section size increased from 64 MiB to 240 MiB for better compression ratios for large executables.
• UDF support was improved.
• Support for hard links in CPIO archives.
• Optimizations and changes in WIM creation code.
• Improved handling of multivolume archives:
  • Only keeps volumes that can still be changed in open state.
  • Reduced number of simultaneously open files for Linux/macOS to avoid failures with large numbers of volumes.
• Optimized the context menu in Explorer for cases with a large number of files.
• Improved drag-and-drop operations in 7-Zip File Manager, including support for the right mouse button in some cases.
• Bug fixes:
  • ZIP archives: Fixed issues with multithreaded compression to stdout stream.
  • ext4 archives: Fixed extraction of symbolic links to directories.
  • HFS and APFS archives: Fixed decoding of uncompressed blocks in compressed forks.
  • HFS: Added support for zlib without Adler.
  • Other minor bugs were fixed.

22.01 - 2022-07-15

• UDF support was improved to version 2.60.
• Improved HFS and APFS support.

22.00 - 2022-06-15

• 7-Zip now can extract APFS (Apple File System) images used in DMG files.
• 7-Zip now can create TAR archives in POSIX (pax) tar format with the switches: -ttar -mm=pax or -ttar -mm=posix.
• Support for storing additional file timestamps with high precision (1 ns in Linux) in tar/pax archives with the following switches: -ttar -mm=pax -mtp=3 -mtc -mta.
• New TAR-related switches for Linux:
  • -snoi: Store owner/group IDs in archive or set them for extracted files.
  • -snon: Store owner/group names in archive.
• New -snz switch to propagate Zone.Identifier stream to extracted files (Windows).
• Added an option "Propagate Zone.Id stream" in Tools/Options/7-Zip menu.
• New "Options" window in "Add to archive" allows selecting metadata to include and an option to not change source files' last access time.
• Some bugs were fixed.

21.07 - 2021-12-26

• 7-Zip now can extract VHDX disk images (Microsoft Hyper-V Virtual Hard Disk v2 format).
• New switches:
  • -spm
  • -im!{file_path}: Exclude directories from processing for specified paths without a trailing path separator.
• Allowed using the -m prefix in the "Parameters" field of the "Add to Archive" window.
• Slightly adjusted file sorting order in archives for better consistency in cases with overlapping directory and file names.
• TAR archives created by 7-Zip are now more consistent with those created by the GNU TAR program.

21.06 - 2021-11-24

• The "Add to Archive" window now allows setting a memory usage (RAM) limit for compressing.
• New switches to set memory usage limits:
  • -mmemuse={N}g
  • -mmemuse=p{N}
• Fixed a bug in versions 21.00-21.05 where directory attributes were not set during extraction.
• Some bugs were fixed.

21.04 beta - 2021-11-02

• Reduced the number of CPU threads for compression when RAM is insufficient for large LZMA2 dictionary.
• 7-Zip now can create and check file.sha256 text files containing file names and SHA-256 checksums, compatible with sha256sum:
  • Commands for GUI context menu:
    • 7-Zip / CRC SHA / SHA-256 -> file.sha256
    • 7-Zip / CRC SHA / Test Archive: Checksum
  • Commands for command line:
    • 7z a -thash file.sha256 *.txt
    • 7z t -thash file.sha256
    • 7z t -thash -shd. file.sha256
• New -shd{dir_path} switch to specify the directory for checking files referenced in file.sha256.
• New -xtd switch to exclude directory metadata records from processing.

21.03 beta - 2021-07-20

• Increased maximum dictionary size for LZMA/LZMA2 compression to 4 GB (3840 MiB).
• Minor speed optimizations in LZMA/LZMA2 compression.

21.02 alpha - 2021-05-06

• 7-Zip now writes an additional field for filenames in UTF-8 encoding to ZIP archives, improving cross-system compatibility.
• Released the command-line version of 7-Zip for macOS.
• Increased LZMA and LZMA2 decompression speed in ARM64 versions for macOS and Linux by 20%-60%.
• Improvements and changes in ZIP, TAR, and NSIS code.

21.01 alpha - 2021-03-09

• Released the command-line version of 7-Zip for Linux.
• Improved speed for the ARM64 version by utilizing hardware CPU instructions for AES, CRC-32, SHA-1, and SHA-256.
• Fixed a bug in versions 18.02 - 21.00 where 7-Zip couldn't correctly extract some ZIP archives created with the xz compression method.
• Some bugs were fixed.

21.00 alpha - 2021-01-19

• Implemented internal code changes.
• Fixed various bugs.
• Added new localizations: Tajik, Uzbek (Cyrillic).

20.02 alpha - 2020-08-08

• Increased the default number of LZMA2 chunks per solid block in 7z archives to 64, improving compression speed for large archives on systems with many CPU cores.
• Increased PPMd compression/decompression speed for 7z/ZIP/RAR archives.
• Introduced the new -ssp switch to prevent the system from modifying the "Last Access Time" property of source files during archiving or hashing.
• Fixed various bugs.
• Added new localization: Swahili.

20.00 alpha - 2020-02-06

• Added new optional match finders for LZMA/LZMA2 compression: bt5 and hc5, which work faster for highly redundant data.
• Improved compression ratio for Fast and Fastest levels with updated default settings:
  • Fastest (-mx1): hc5 match finder with 256 KB dictionary.
  • Fast (-mx3): hc5 match finder with 4 MB dictionary.
• Optimized speed for multithreaded LZMA/LZMA2 compression at Normal, Maximum, and Ultra levels.
• Updated bzip2 decoding code to support bzip2 archives created by the lbzip2 program.
• Fixed various bugs.
• Added new localization: Turkmen.

19.02 alpha - 2019-09-05

• Added support for unpacking files encoded with Base64 (b64 filename extension).
• Implemented support for new x86/x64 hardware instructions for SHA-1 and SHA-256, improving speeds for:
  • Hash value calculation.
  • Encryption/decryption in ZIP AES.
  • Key derivation for encryption/decryption in 7z/ZIP/RAR archives.
• Improved speed for ZIP AES encryption and 7z/ZIP/RAR AES decryption using new x86/x64 VAES (AVX Vector AES) instructions on Intel Ice Lake CPUs.
• Optimized 7-Zip benchmark decompression by 2%.
• Fixed various bugs.

19.00 - 2019-02-21

• Increased encryption strength for 7z archives by upgrading the random initialization vector size from 64-bit to 128-bit and improving the pseudo-random number generator.
• Fixed various bugs.

18.06 - 2018-12-30

• Improved LZMA/LZMA2 compression speed by 3%-10% with minor changes in compression ratio.
• Fixed a memory leak in the xz decoder (affecting versions 18.02-18.05).
• Addressed an issue where only one CPU thread was used for bz2 archive creation (versions 18.02-18.05).

18.05 - 2018-04-30

• Improved LZMA/LZMA2 compression speed:
  • 8% increase for Fastest/Fast levels.
  • 3% increase for Normal/Maximum levels.
• Updated the Properties (Info) and CRC/SHA results windows to a "list view" format.
• Made improvements in ZIP, HFS, and DMG code.
• Addressed issues with "Large memory pages" mode in Windows 10 before revision 1709 (16299).
• Fixed a vulnerability in RAR unpacking code (CVE-2018-10115).
• Fixed various bugs.

17.00 beta - 2017-04-29

• Improved ZIP unpacking code.
• 7-Zip now reserves file space before writing during extraction, reducing file fragmentation.
• Fixed various bugs that could cause crashes.
• Internal code changes.

16.04 - 2016-10-04

• Fixed a bug where the 16.03 exe installer under Vista didn't create Start menu links.
• Fixed bugs in RAR code.

16.03 - 2016-09-28

• Installer and SFX modules now include protection against DLL preloading attacks.
• Fixed bugs in 7z, NSIS, SquashFS, RAR5, and other code.

16.02 - 2016-05-21

• 7-Zip now supports extracting multivolume ZIP archives (z01, z02, ..., zip).
• Fixed various bugs.

15.14 - 2015-12-31

• Improvements in 7-Zip File Manager:
  • Enhanced "Open file from archive" operation.
  • Improved "Tools/Options" window.
• Fixed a bug causing incorrect mouse cursor capture during drag-and-drop operations.
• Fixed various bugs.
• Added new localization: Yoruba.

15.12 - 2015-11-19

• Release version.

15.11 beta - 2015-11-14

• Fixed various bugs.

15.10 beta - 2015-11-01

• Fixed a bug in versions 9.21-15.09 where parameters for gzip and bzip2 formats were ignored in archive creation.
• Fixed various bugs.

15.09 beta - 2015-10-16

• Added support for extracting ext2 and multivolume VMDK images.
• Fixed various bugs.

15.08 beta - 2015-10-01

• Added support for extracting ext3 and ext4 (Linux file system) images.
• Fixed various bugs.

15.07 beta - 2015-09-17

• Added support for extracting GPT images and single file QCOW2, VMDK, VDI images.
• Added support for extracting solid WIM archives with LZMS compression.
• Fixed various bugs.

15.06 beta - 2015-08-09

• Added support for extracting RAR5 archives.
• 7-Zip no longer sorts files by type when adding to solid 7z archives.
• New -mqs switch to sort files by type for solid 7z archives.
• Fixed a bug in 7-Zip File Manager where the "Move" operation failed to delete empty files.
• Fixed a bug in 15.05 where the console version added text to the stdout stream when using the -so switch.
• Fixed a bug in versions 9.30-15.05 where 7-Zip couldn't open multivolume SFX RAR archives.
• Fixed various bugs.

15.05 beta - 2015-06-14

• Introduced a new installer for 7-Zip.
• 7-Zip now supports creating 7z, xz, and zip archives with a 1536 MB dictionary for LZMA/LZMA2.
• 7-Zip File Manager can now manage alternate file streams on NTFS volumes via the "File / Alternate Streams" menu.
• Added support for extracting .zipx archives using xz compression.
• Introduced new optional "section size" parameter for BCJ2 filter to improve compression ratios.
• Optimized BCJ2 filter speed and SHA-1/SHA-256 calculations.
• Improved console version:
  • Uses stderr for error messages.
  • Shows processed file names only in progress lines by default.
  • New switches:
    • -bb[0-3]: Set log output level.
    • -bs[o|e|p][0|1|2]: Set stream for output messages.
    • -bt: Show execution time statistics.
    • -myx[0-9]: Set file analysis level.
    • -mmtf-: Enable single thread mode for filters.
• Fixed various bugs, including issues with NTFS permissions, command line renaming, and ZIP archive creation.

9.38 beta - 2015-01-03

• Fixed various bugs.

9.36 beta - 2014-12-26

• Fixed a bug in the command-line version where 7-Zip created temporary archives in the current folder instead of the folder containing the updated archive if -w{Path} was not specified.
• Fixed a bug in versions 9.33-9.35 where 7-Zip ignored file reading errors during 7z or gz archive creation, resulting in incomplete archives. The fixed version stops archive creation and reports errors.
• Fixed various bugs.

9.35 beta - 2014-12-07

• Fixed a crash during ZIP archive creation when the number of CPU threads exceeded 64.
• Fixed a bug in versions 9.31-9.34 where 7-Zip couldn't correctly extract ISO archives larger than 4 GiB.
• Fixed a bug in versions 9.33-9.34 where the "Compress shared files" option and -ssw switch didn't work.
• Fixed a bug in versions 9.26-9.34 where 7-Zip File Manager could crash for some archives opened in "Flat View" mode.
• Fixed various bugs.

9.34 alpha - 2014-06-22

• Fixed a bug in version 9.33 where the command-line version worked incorrectly with relative paths in exclude filename options and absolute paths in include filename options.
• Fixed a bug in versions 9.26-9.33 where 7-Zip couldn't open certain unusual 7z archives created by other software.
• Fixed a bug in versions 9.31-9.33 where 7-Zip could crash with the -tcab switch.

9.33 alpha - 2014-06-15

• Added support for showing icons for 7-Zip items in Explorer's context menu.
• Enhanced "Add to archive" dialog with new options:
  • New "Path Mode" options.
  • "Delete files after compression" option.
  • NTFS options for WIM and TAR formats:
    • Store symbolic links.
    • Store hard links.
    • Store alternate data streams.
    • Store file security.
• Improved "Extract" dialog with new options:
  • Set output folder name.
  • Eliminate duplication of root folder.
  • "Absolute pathnames" in "Path Mode".
  • "Restore file security" for WIM archives.
• New "File / Link" dialog in File Manager to create symbolic and hard links.
• Command-line enhancements:
  • -spd: Disable wildcard matching for file names.
  • -spe: Eliminate duplication of root folder for extract archive command.
  • -snh: Store hard links as links (WIM and TAR formats).
  • -snl: Store symbolic links as links (WIM and TAR formats).
• Improved NSIS support.
• Fixed various bugs, including:
  • Command line version returning incorrect exit codes for test and extract commands in versions 9.31-9.32.
  • Issues with archives containing anti-items.
• Added Mongolian localization.

9.32 alpha - 2013-12-01

• Added support for creating multivolume SFX archives in 7z format.
• Improved support for ZIP, NSIS, HFS, and AR formats.
• 7-Zip now supports files larger than 4 GiB in ISO archives.
• Improved compression ratio in 7z format for large executable files with enhanced BCJ2 filter.
• Added CRC and SHA checksum calculation via Explorer's context menu.
• Enhanced file sorting in File Manager to account for numbers in filenames.
• Introduced new command-line options:
  • -t#: Open files in "Parser" mode.
  • -stx{Type}: Exclude archive types.
• Fixed various bugs, including issues with ZIP archives and multi-volume archive decompression.
• Added Irish localization.

9.30 alpha - 2012-10-26

• LZMA2 became the default compression method for .7z format.
• Added support for updating WIM archives and moving files to archives in File Manager.
• Set UTF-8 as the default encoding for TAR format, with -mcp=1 switch for OEM encoding.
• Introduced new command-line options:
  • rn: Rename files in archive.
  • -sdel: Delete files after including in archive.
  • -sns: Store NTFS alternate streams for WIM format.
  • -sni: Store NT security information for files.
  • -stl: Set archive timestamp from the most recently modified file.
• Improved DMG support.
• Fixed various bugs, including issues with non-solid 7z archives in versions 9.26-9.29.
• Added Aragonese localization.

9.19 beta - 2010-11-11

• The console version no longer shows entered passwords for security purposes.
• Fixed various bugs.

9.18 beta - 2010-11-02

• Added support for unpacking SquashFS and CramFS filesystem images.
• 7-Zip can now unpack some TAR and ISO archives with incorrect headers.
• Introduced a small SFX module for installers (available in the Extra package).
• Fixed various bugs.

9.17 beta - 2010-10-04

• Fixed a disk fragmentation issue for ZIP archives created by 7-Zip.

9.16 beta - 2010-09-08

• Added support for files larger than 8 GB in TAR archives.
• Improved NSIS support.
• Fixed various bugs.
• New localizations: Hindi, Gujarati, Sanskrit.

9.15 beta - 2010-06-20

• Fixed various bugs.
• New localization: Tatar.

9.14 beta - 2010-06-04

• Improved WIM support.

9.13 beta - 2010-04-15

• 7-Zip now stores NTFS file timestamps in ZIP archives.
• Added a new "Open archive >" item in the context menu to select archive type for some files.
• Fixed various bugs.
• New localization: Uyghur.

9.12 beta - 2010-03-24

• Improved ZIP / PPMd compression ratio in Maximum and Ultra modes.
• Fixed a bug in 7-Zip 9.* beta where the LZMA2 codec didn't work if more than 10 threads (or more than 20 threads in some modes) were used.

9.11 beta - 2010-03-15

• Added PPMd compression support for ZIP archives.
• Speed optimizations in the PPMd codec.
• Improved support for archives in installers.
• Fixed various bugs.
• New localization: Kazakh.

9.10 beta - 2009-12-22

• Fixed a bug in 7-Zip 9.09 beta where it created incorrect ZIP archives if ZipCrypto encryption was used.

9.09 beta - 2009-12-12

• Added support for unpacking Apple Partition Map (APM) disk images.
• Optimized AES code speed for Intel's 32nm CPUs.
• Optimized CRC calculation code for Intel's Atom CPUs.
• Fixed various bugs.

9.07 beta - 2009-08-27

• Added an option to specify a Diff program in 7-Zip File Manager options.
• Fixed various bugs.

9.06 beta - 2009-08-17

• Added support for unpacking MSLZ archives.
• Partial parsing support for EXE resources, SWF, and FLV files.
• Fixed various bugs.

9.04 beta - 2009-05-30

• Added support for updating solid .7z archives.
• Added support for LZMA2 compression method and XZ archives.
• Added support for unpacking NTFS, FAT, VHD, and MBR archives.
• Added support for unpacking GZip, BZip2, LZMA, XZ, and TAR archives from stdin.
• Added support for opening, copying, and compressing disk images from the \\.\ folder.
• New -scrc switch to calculate total CRC-32 during extraction/testing.
• New -scc{WIN|DOS|UTF-8} switch to specify charset for console input/output.
• Fixed various bugs.

4.42 - 2006-05-14

• Increased compressing speed and memory requirements. Default dictionary sizes:
  • Fastest: 64 KB
  • Fast: 1 MB
  • Normal: 4 MB
  • Max: 16 MB
  • Ultra: 64 MB
• BZip2 compressing/decompressing now supports multi-threading.
• Multi-threading mode is now the default for multi-processor systems.
• 64-bit version supports 1 GB dictionary size.
• 7z/LZMA now supports these match finders: HC4, BT2, BT3, BT4.
• Improved compression ratio in Zip/GZip/Deflate in Ultra mode.
• Added support for unpacking ISO archives and some installers created by NSIS.
• Introduced optional "Flat View" mode in 7-Zip File Manager.
• 7-Zip File Manager can now calculate CRC checksums for files.
• Improved behavior of -x switch with relative paths.
• Added new switch for console version: -slt for technical archive info.
• New -scs{WIN|DOS|UTF-8} switch for charset specification in list files. Default is UTF-8.
• Fixed various bugs.
• New localizations: Albanian, Kurdish.

4.32 - 2005-12-09

• Fixed a bug where 7-Zip 4.31 didn't work on Windows 95.

4.31 - 2005-12-04

• Minor changes.
• New localization: Basque.

4.30 beta - 2005-11-18

• Removed files: 7zFMn.exe, 7zGn.exe, 7-zipn, 7za.exe, 7zC.sfx.
• 7-Zip now uses an uncompressed SFX module: 7z.sfx.
• SFX modules 7z.sfx and 7zCon.sfx now use msvcrt.dll.
• Speed optimizations for LZMA Maximum/Ultra compressing.
• LZMA now supports a word size of up to 273.
• 7-Zip reduces dictionary size for LZMA when compressing files smaller than the dictionary size.
• Added support for large memory pages, which improves compressing speed but may require administrative rights and system reboot.
• Fixed various bugs.

4.29 beta - 2005-09-28

• Fixed a bug where 7-Zip 4.28 beta didn't work correctly on Windows 95/98/Me.

4.28 beta - 2005-09-27

• Fixed a bug in 4.27 beta where multivolume archives were created incorrectly.
• Resolved "duplicate filename" collision issue with ligatures.

4.27 beta - 2005-09-21

• Added support for unpacking CHM/HXS (MS HTML HELP) archives.
• Added support for unpacking multivolume CAB archives.
• 7-Zip now deletes files to the Recycle Bin by default. Use Shift+Delete for permanent deletion.
• Fixed various bugs.
• New localization: Tatarish.

4.26 beta - 2005-08-05

• Added support for extracting LZH format.
• Fixed various bugs.
• New localization: Ido.

4.25 beta - 2005-07-31

• 7-Zip now continues compressing and displays a warning when it cannot find a specified file.
• Standard selection mode is now supported in the file list.
• Fixed various bugs.

4.24 beta - 2005-07-06

• Added right-click Drag and Drop support in Explorer.
• Command-line version now supports short file names (e.g., FILENA~1.TXT).
• 7-Zip now verifies that specified files exist before compressing when no wildcards or -r switch are used.
• Fixed various bugs.

4.23 - 2005-06-29

• Added Drag and Drop support.
• 7-Zip File Manager can now copy files from one archive to another.
• Fixed various bugs.
• New localizations: Extremaduran, Malay.

4.07 beta - 2004-10-03

• Major code changes in this version. Users are advised to avoid compressing important data and test archives after compression.
• Unified command-line interface for GUI and console versions.
• 7-Zip now supports extracting or testing multiple archives in a single command.
• Files locked by other applications are skipped during compression with a warning, instead of interrupting the process.
• Updated command-line interface:
  • Supports absolute pathnames.
  • Simplified syntax (e.g., replacing complex wildcard commands).
• Improved archive type detection for files with unusual extensions.
• Added support for RAR archives with encrypted headers.
• Improved support for CPIO format.
• GZip and BZip2 formats now support:
  • Compressing from stdin (-si switch).
  • Compressing and extracting to stdout (-so switch).
• 7-Zip File Manager enhancements:
  • Added "Split" and "Combine" commands.
  • New list view options: "Full row select" and "Show grid lines."
• Fixed various bugs.
• New localizations: Friulian, Macedonian, Mongolian, Tamil, Thai.

3.13 - 2003-12-11

• Fixed various small bugs.

3.12 - 2003-12-10

• Added options for selecting compression method, dictionary size, and word size in the "Add to archive" dialog box, along with memory usage display.
• Introduced toolbars in 7-Zip File Manager.
• Added a "Benchmark" command in 7-Zip File Manager to measure compressing and decompressing speeds.
• Fixed various bugs.

3.11 - 2003-10-06

• Added limitations for solid block size to improve random file decompression speed:
  • Store mode: 0 B
  • Fast mode: 16 MB
  • Normal mode: 256 MB
  • Maximum mode: 1 GB
  • Ultra mode: 4 GB
• 7z.exe, 7za.exe, and SFX modules now support Unicode file names on Windows NT/2000/XP/2003.
• Removed 7zn.exe and 7zan.exe from the package.
• Fixed various bugs.
• New localization: Afrikaans.

3.10 - 2003-09-27

• Added support for Drag-and-Drop from external applications.
• GUI version now supports compressing files with absolute paths.
• The compression dialog no longer suggests bzip2 and gzip2 types for multiple selected files.
• Added optional auto-renaming of existing files during extraction (-aot switch).
• Fixed various bugs.

3.09.02 - 2003-09-20

• Introduced optional limitations for solid block size to improve random file decompression speed (-ms switch).

3.09.01 beta - 2003-09-06

• Added automatic compression filter for executable files (-mf switch).
• Compression levels for 7z updated with improved BCJ and BCJ2 filters.
• Supported updating solid 7z archives without requiring repacking of solid blocks.
• Fixed various bugs.

3.08 beta - 2003-08-19

• Added "fast compressing mode" (-mx=1 switch).
• Added multi-threading support for multi-processor systems or Pentium 4 with Hyper-Threading.
• Introduced "Encrypt file names" option.
• Added new context menu items:
  • "Extract here"
  • "Extract to <Folder>"
  • "Compress and email"
• Reduced registry usage in internal reconstruction.
• New localization: Esperanto.

2.30 Beta 26 - 2003-01-12

• Added support for Deflate64 method in Zip archives.
• Added support for RAR 1.50 archives.
• Fixed various bugs.

2.30 Beta 25 - 2003-01-02

• Added encryption feature for 7z format (AES-256).
• Introduced new optional archive header compression mode (-mhcf).
• Archive headers are now always compressed with the LZMA method.
• Allowed updating non-solid 7z archives without -ms=off.
• Added support for folder creation and item renaming inside archives.
• Support for encrypted RAR3 archives and Unicode names in RAR3 archives.
• Fixed various bugs.
• New localizations: Lithuanian, Voro.

2.30 Beta 24 - 2002-11-01

• Internal reconstructions and slight changes to the -m switch syntax.
• Fixed various bugs.
• New localizations: Catalan, Norwegian, Romanian.

2.30 Beta 23 - 2002-09-07

• Added encryption feature for ZIP format.
• Percent progress indicators for some operations.
• Fixed various bugs.

2.30 Beta 22 - 2002-08-31

• Introduced the 7-Zip File Manager program.
• The command-line version no longer allows absolute paths for compressing files.
• New localizations: Belarusian, Greek.
• Fixed a bug in the FAR plugin for incorrect updating when archives lack explicit directory items for file items.
• Fixed various bugs.

2.30 Beta 21 - 2002-07-08

• Reduced RAM requirements for LZMA (7z) compression.
• Fixed a small bug in the FAR plugin.

2.30 Beta 20 - 2002-07-01

• Reduced RAM requirements for LZMA (7z) decompression.
• New localization: Turkish.
• Fixed various bugs.

2.30 Beta 19 - 2002-04-11

• Added support for RAR 3.0 archives.
• New localizations: Danish, Ukrainian.

2.30 Beta 18 - 2002-03-25

• Slightly increased compression speed in 7z format.
• New localizations: Estonian, Finnish.
• Fixed various bugs.

2.30 Beta 17 - 2002-03-03

• Added support for ARJ archives.
• New localization: Chinese Simplified.

2.30 Beta 16 - 2002-02-24

• Added support for RPM and CPIO archives.
• Introduced a new fast compression mode for LZMA (-m0a=0).
• Added new match finders for LZMA: bt4b, hc3, hc4.
• Fixed various bugs.

2.30 Beta 15 - 2002-02-17

• Slightly improved compression ratio in 7z format.
• New localization: Dutch.

2.30 Beta 14 - 2002-02-10

• Added speed optimization for multiprocessor systems (-mmt switch).
• New localizations: Czech, Japanese, Polish.
• Fixed various bugs.

2.30 Beta 13 - 2002-01-31

• Introduced a new SFX module for installers.
• Added a new match finder for LZMA: bt3.
• New localizations: Portuguese, Portuguese (Brazil), Serbo-Croatian.
• Fixed various bugs.

2.30 Beta 12 - 2002-01-16

• Fixed a memory leak issue from Beta 11.
• New localization: Hungarian.

2.30 Beta 11 - 2002-01-15

• Added archive testing feature in the GUI version.
• Enabled usage of more than 256 MB of RAM in all Windows versions.
• New localizations: Bulgarian, Chinese Traditional, Latvian, Slovak.
• Fixed various bugs.

2.30 Beta 10 - 2002-01-11

• Fixed bugs related to updating 7z archives in Beta 8 and 9.
• Fixed Unicode issues in Beta 9 on Windows NT4.
• New localizations: Arabic, French, Italian, Slovenian, Spanish.

2.30 Beta 9 - 2002-01-08

• Introduced program localization for English, German, and Russian.
• Added optimized program versions for Windows NT4/2000/XP.
• Introduced two new match finders for LZMA: pat3h, pat4h.
• Fixed various bugs.

2.30 Beta 8 - 2001-12-21

• Added support for ZIP archives not supported by previous versions.
• Introduced a new state (-uw switch) for cases when 7-Zip cannot detect whether a file is newer or the same.
• Added support for anti-items in 7z format for incremental updates (-u with action #3).
• Fixed various bugs.

2.30 Beta 7 - 2001-11-04

• Added BCJ2: a new converter for x86 code.
• Improved support for tar archives with very long file names (GNU extension).
• Introduced multistream coders in 7z (-mb switch).
• Expanded compressing parameters for ZIP and GZip in the console version (-m switch).
• Added solid compression and parameter options in the Windows version.
• Introduced auto-renaming existing files during extraction and an overwrite mode switch (-ao).
• Fixed various bugs.

2.30 Beta 6 - 2001-10-13

• Added support for the 7z format in the MultiArc plugin for FAR Manager.
• Fixed various bugs.

2.30 Beta 5 - 2001-10-02

• Enabled creating SFX archives from Explorer.
• Introduced 7zWin.sfx: Windows version of the SFX module.
• Added automatic .exe extension for SFX archive names.
• 7za.exe now supports 7z, BZip2, GZip, tar, and zip formats.
• Fixed various bugs.

2.30 Beta 4 - 2001-09-15

• Added self-extracting capability for the 7z format.
• Set 7z as the default format for 7z.exe and 7za.exe.
• Updated 7z default mode to use bt234 match finder and solid compression.
• Increased dictionary size for 7z maximum mode (-mx) to 4MB.

2.30 Beta 3 - 2001-09-10

• Fixed a bug where decompressing .7z solid archives containing empty files failed.
• Introduced a standalone command-line version: 7za.exe (only for 7z format).
• Slightly increased compressing speed for Deflate format (ZIP, GZip).

2.30 Beta 2 - 2001-08-30

• Added support for the new 7z format with high compression ratio.
• Introduced -bd (Disable percentage indicator) switch for the console version.
• Fixed a bug where compression commands with non-recursive wildcards and subfolders were executed incorrectly.
• Fixed various bugs.

2.30 Beta 1 - 2001-05-07

• Increased speed of reading archive contents.
• Fixed a bug displaying filenames with national charsets in some ZIP archives.
• Added support for compressing files larger than 4GB into GZip archives.

2.24 - 2001-03-21

• Fixed bugs in GZip and Cab decoders.

2.23 - 2001-03-04

• Added support for opening archive items and context menus in Explorer.
• Introduced automatic extension addition to archive names in the console version.
• Fixed various bugs.

2.22 - 2001-01-21

• Added support for ZIP archives containing more than 65,535 files.
• Increased speed of the Explorer plugin.
• Limited archive search to the first 1MB of the file for faster results.
• Fixed various bugs.
• Replaced 7zip.exe, far7zip.reg, and far7zip2.reg files with far7z.reg.

2.21 - 2000-12-21

• Improved FAR Plugin:
  • Shows a process box during archive opening.
  • Ctrl-A displays file properties.
  • Alt-F6 extracts selected files to the current directory immediately.
• Fixed bugs related to:
  • Entering subfolders in Explorer under Windows ME/2000.
  • Decompressing solid RAR archives.
  • Displaying file names with national charsets in the console version.

2.20 - 2000-11-20

• Added support for BZip2 and Cab formats.
• Introduced a new program architecture with external compression and cryptographic modules.
• Added decryption support for RAR and ZIP formats.
• Introduced a new console client.
• Fixed various bugs.

2.11 - 2000-06-15

• Fixed bugs:
  • The FAR Plugin incorrectly processed names of subdirectories using non-English charsets.
  • The gzip plugin failed to compress empty files.

2.10 - 2000-05-16

• Introduced the first level 7-Zip Plugin for FAR Manager.
• Added a GUI version with integration into the Windows Shell.
• Added support for compressing and decompressing GZip and TAR formats.
• Added support for decompressing RAR files.
• Included Install & Uninstall support.
• Fixed various bugs.

2.01 - 1999-09-19

• Fixed a small bug.
• Improved compression ratio for certain files.

2.00 - 1999-07-18

• Official release.
• Fixed a major bug in previous versions where files referred by direct paths (without wildcards) containing subdirectory parts were processed incorrectly.
• Improved compression and decompression speed.
• Introduced the -mx switch (maximize compression).
• Fixed various small bugs.

2.00 Beta 1 - 1999-01-02

• Original beta version.