Nodiadau rhyddhau, atgyweiriadau a hanes

Newidiadau a hanes rhyddhau 7zip

Porwch hanes fersiynau 7zip, nodweddion newydd, bug fixes, gwelliannau perfformiad a security fixes o’r mwyaf newydd i’r hynaf.

Newidiadau a hanes rhyddhau 7zip

7zip 26.03

2026-09-03

Improved support for Joliet ISO images and Compound archives.
Some bugs and vulnerabilities were fixed.
CVE-2026-58052 : 7zip failed to preserve the Mark-of-the-Web when extracting a crafted archive.

7zip 26.02

2026-06-25

Some bugs and vulnerabilities were fixed.
CVE-2026-14266 : XZ Decompression Heap-based Buffer Overflow Remote Code Execution.

7zip 26.01

2026-04-27

linux version of 7zip can use huge pages (2 MB pages). It can increase compression
speed for 10% for 7z/xz/LZMA/LZMA2 compression.
new -spo[d|c|r] switch specifies the path generation mode for the output directory
for archive extraction. The output directory path is generated from the path specified
in the -o{dir_path} switch and the name of the archive being unpacked.
-spod : for Linux/Posix/macOS: -o{dir_path} specifies the direct path to the output directory.
The asterisk (*) character in {dir_path} will not be replaced by the archive name.
-spoc : 7zip will concatenate the path specified in -o{dir_path} with the archive name
to form the final path to the output directory.
-spor : 7zip will replace asterisk (*) character in the path specified in the -o{dir_path}
with the archive name. This is the default option.
Some bugs and vulnerabilities were fixed.
CVE-2026-48092 : A heap memory disclosure via SquashFS fragment offset integer overflow on 32-bit builds.
CVE-2026-48095 : A heap buffer overflow in the NTFS archive handler.
CVE-2026-48101 : An uninitialized memory disclosure vulnerability in the UEFI archive handler.
CVE-2026-48102 : A heap out-of-bounds read in the UDF archive handler.
CVE-2026-48103 : A heap out-of-bounds read in the WIM archive handler.
CVE-2026-48104 : An uninitialized heap read in the SquashFS archive handler.
CVE-2026-48111 : An out-of-bounds read vulnerability UEFI archive handler.
CVE-2026-48112 : A heap out-of-bounds read in 7zip Ar archive handler.

7zip 26.00

2026-02-12

improved code for ZIP, CPIO, RAR, UFD, QCOW, Compound.
7zip File Manager: improved sorting order of the file list. It uses file name as secondary sorting key.
7zip File Manager: improved Benchmark to support systems with more than 64 CPU threads.
the bug was fixed: 7zip could not correctly extract TAR archives containing sparse files.
some bugs were fixed.

7zip 25.01

2025-08-03

CVE-2025-55188 : The code for handling symbolic links has been changed
to provide greater security when extracting files from archives.
Command line switch -snld20 can be used to bypass default security
checks when creating symbolic links.

7zip 25.00

2025-07-05

7zip for Windows can now use more than 64 CPU threads for compression
to zip/7z/xz archives and for the 7zip benchmark.
If there are more than one processor group in Windows (on systems with more than
64 cpu threads), 7zip distributes running CPU threads across different processor groups.
bzip2 compression speed was increased by 15-40%.
deflate (zip/gz) compression speed was increased by 1-3%.
improved support for zip, cpio and fat archives.
fixed some bugs.
CVE-2025-11001 and CVE-2025-11002 : A vulnerability was fixed for symbolic links processing,
when extracting files from archives.
the bug was fixed : CVE-2025-53816 : 7zip could work incorrectly for some incorrect RAR archives.
the bug was fixed : CVE-2025-53817 : 7zip could crash for some incorrect COM (Compound File) archives.

7zip 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.
7zip 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, 7zip shows the progress of moving
the archive file, as this operation can take a long time if the archive is large.
The bug was fixed: 7zip File Manager didn't propagate Zone.Identifier stream
for extracted files from nested archives (if there is open archive inside another open archive).
Some bugs were fixed.

7zip 24.08

2024-08-11

The bug in 7zip 24.00-24.07 was fixed:
For creating a zip archive: 7zip could write extra zero bytes after the end of the archive,
if a file included to archive cannot be compressed to a size smaller than original.
The created zip archive is correct except for the useless zero bytes after the end of the archive.
When unpacking such a zip archive, 7zip displays a warning:
"WARNING: There are data after the end of archive".
The bug was fixed: there was a leak of GDI objects (internal resources in Windows)
in "Confirm File Replace" window, causing problems after 1600 displays of "Confirm File Replace"
window from same running 7zip process.
Some optimizations for displaying file icons in 7zip File Manager and in "Confirm File Replace" window.
Some bugs were fixed. CVE-2024-11612.

7zip 24.07

2024-06-19

The bug was fixed: 7zip could crash for some incorrect ZSTD archives (CVE-2024-11477).

7zip 24.06

2024-05-26

The bug was fixed: 7zip could not unpack some ZSTD archives.

7zip 24.05

2024-05-14

New switch -myv={MMNN} to set decoder compatibility version for 7z archive creating.
{MMNN} is 4-digit number that represents the version of 7zip without a dot.
If -myv={MMNN} switch is specified, 7zip will only use compression methods that can
be decoded by the specified version {MMNN} of 7zip and newer versions.
If -myv={MMNN} switch is not specified, -myv=2300 is used, and 7zip will only
use compression methods that can be decoded by 7zip 23.00 and newer versions.
New switch -myfa={FilterID} to allow 7zip to use the specified filter method for 7z archive creating.
New switch -myfd={FilterID} to disallow 7zip to use the specified filter method for 7z archive creating.
Some bugs were fixed.

7zip 24.04

2024-04-05

New menu item in 7zip File Manager: "Tools / Delete Temporary Files...".
This menu item opens a window showing temporary folders and files
created by 7zip in the user's "Temp" folder on a Windows system.
In this window, the user can delete temporary files.

7zip 24.03

2024-03-23

7zip now can use new RISCV filter for compression to 7z and xz archives.
RISCV filter can increase compression ratio for data containing executable
files compiled for RISC-V architecture.
The speed for LZMA and LZMA2 decompression in ARM64 version for Windows
was increased by 20%-60%.
7zip GUI and 7zip File Manager can ask user permission to unpack RAR archives that
require big amount of memory, if the dictionary size in RAR archive is larger than 4 GB.
new switch -smemx{size}g : to set allowed memory usage limit for RAR archive unpacking.
RAR archives can use dictionary up 64 GB. Default allowed limit for RAR unpacking is 4 GB.
7zg.exe (7zip GUI): -y switch disables user requests and messages.
7zip shows hash methods XXH64 and BLAKE2sp in context menu.
-slmu switch : to show timestamps as UTC instead of LOCAL TIME.
-slsl switch : in console 7zip for Windows : to show file paths with
linux path separator slash '/' instead of backslash separator '\'.
7zip supports .sha256 files that use backslash path separator '\'.
Some bugs were fixed.

7zip 24.01

2024-01-31

7zip now can unpack ZSTD archives (.zst filename extension).
7zip now can unpack ZIP, SquashFS and RPM archives that use ZSTD compression method.
7zip now supports fast hash algorithm XXH64 that is used in ZSTD.
7zip now can unpack RAR archives (that use larger than 4 GB dictionary) created by new WinRAR 7.00.
7zip now can unpack DMG archives that use XZ (ULMO/LZMA) compression method.
7zip now can unpack NTFS images with cluster size larger than 64 KB.
7zip now can unpack MBR and GPT images with 4 KB sectors.
Speed optimizations for archive unpacking: rar, cab, wim, zip, gz.
Speed optimizations for hash caclulation: CRC-32, CRC-64, BLAKE2sp.
The bug was fixed: 7zip for Linux could fail for multivolume creation in some cases.
Some bugs were fixed.

7zip 23.01

2023-06-20

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

7zip 23.00

2023-05-07

7zip now can use new ARM64 filter for compression to 7z and xz archives.
ARM64 filter can increase compression ratio for data containing executable
files compiled for ARM64 (AArch64) architecture.
Also 7zip now parses executable files (that have exe and dll filename extensions)
before compressing, and it selects appropriate filter for each parsed file:
- BCJ or BCJ2 filter for x86 executable files,
- ARM64 filter for ARM64 executable files.
Previous versions by default used x86 filter BCJ or BCJ2 for all exe/dll files.
Default section size for BCJ2 filter was changed from 64 MiB to 240 MiB.
It can increase compression ratio for executable files larger than 64 MiB.
UDF: support was improved.
cpio: support for hard links.
Some changes and optimizations in WIM creation code.
When new 7zip creates multivolume archive, 7zip keeps in open state
only volumes that still can be changed. Previous versions kept all volumes
in open state until the end of the archive creation.
7zip for Linux and macOS now can reduce the number of simultaneously open files,
when 7zip opens, extracts or creates multivolume archive. It allows to avoid
the failures for cases with big number of volumes, bacause there is a limitation
for number of open files allowed for a single program in Linux and macOS.
There are optimizations in code for 7zip's context menu in Explorer:
the speed of preparing of the menu showing was improved for cases when big number of
files were selected by external program for context menu that contains 7zip menu commands.
There are changes in code for the drag-and-drop operations to and from 7zip File Manager.
And the drag-and-drop operation with right button of mouse now is supported for some cases.
The bugs were fixed:
- ZIP archives: if multithreaded zip compression was performed with more than one
file to stdout stream (-so switch), 7zip didn't write "data descriptor" for some files.
- ext4 archives: 7zip couldn't correctly extract symbolic link to directory from ext4 archives.
- HFS and APFS archives: 7zip incorrectly decoded uncompressed blocks (64 KiB) in compressed forks.
- HFS : zlib without Adler supported
- Some another bugs were fixed.

7zip 22.01

2022-07-15

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

7zip 22.00

2022-06-15

7zip now can extract APFS (Apple File System) images that can be used in DMG files.
7zip now can create TAR archives in POSIX (pax) tar format with the switches
-ttar -mm=pax or -ttar -mm=posix
7zip now can store 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 switches for Linux version for TAR archives:
-snoi : store owner/group ids in archive or set owner/group ids from archive to extracted files.
-snon : store owner/group names in archive
New -snz switch to propagate Zone.Identifier stream to extracted files (Windows).
New option "Propagate Zone.Id stream" in Tools/Options/7zip menu.
New "Options" window in "Add to archive" allows to select what metadata must be
included to archive. Also it allows to select new option
"Do not change source files last access time".
Some bugs were fixed.

7zip 21.07

2021-12-26

7zip now can extract VHDX disk images (Microsoft Hyper-V Virtual Hard Disk v2 format).
New switches: -spm and -im!{file_path} to exclude directories from processing
for specified paths that don't contain path separator character at the end of path.
In the "Add to Archive" window, now it is allowed to use -m prefix for "Parameters"
field as in command line: -mparam.
The sorting order of files in archives was slightly changed to be more consistent
for cases where the name of some directory is the same as the prefix part of the name
of another directory or file.
TAR archives created by 7zip now are more consistent with archives created by GNU TAR program.

7zip 21.06

2021-11-24

The window "Add to Archive" now allows to set a limit on memory usage (RAM)
that will be used for compressing.
New switch -mmemuse={N}g / -mmemuse=p{N} to set a limit on memory usage (RAM)
for compressing and decompressing.
Bug in versions 21.00-21.05 was fixed:
7zip didn't set attributes of directories during archive extracting.
Some bugs were fixed.

7zip 21.04 beta

2021-11-02

7zip now reduces the number of working CPU threads for compression,
if RAM size is not enough for compression with big LZMA2 dictionary.
7zip now can create and check "file.sha256" text files that contain the list
of file names and SHA-256 checksums in format compatible with sha256sum program.
7zip can work with such checksum files as with archives,
but these files don't contain real file data.
The context menu commands to create and test "sha256" files:
7zip / CRC SHA / SHA-256 -> file.sha256
7zip / CRC SHA / Test Archive : Checksum
The commands for command line version:
7z a -thash file.sha256 *.txt
7z t -thash file.sha256
7z t -thash -shd. file.sha256
New -shd{dir_path} switch to set the directory that is used to check files
referenced by "file.sha256" file for "Test" operation.
If -shd{dir_path} is not specified, 7zip uses the directory where "file.sha256" is stored.
New -xtd switch to exclude directory metadata records from processing.

7zip 21.03 beta

2021-07-20

The maximum dictionary size for LZMA/LZMA2 compressing was increased to 4 GB (3840 MiB).
Minor speed optimizations in LZMA/LZMA2 compressing.

7zip 21.02 alpha

2021-05-06

7zip now writes additional field for filename in UTF-8 encoding to zip archives.
It allows to extract correct file name from zip archives on different systems.
The command line version of 7zip for macOS was released.
The speed for LZMA and LZMA2 decompression in arm64 versions for macOS and Linux
was increased by 20%-60%.
Some changes and improvements in ZIP, TAR and NSIS code.

7zip 21.01 alpha

2021-03-09

The command line version of 7zip for Linux was released.
The improvements for speed of ARM64 version using hardware CPU instructions
for AES, CRC-32, SHA-1 and SHA-256.
The bug in versions 18.02 - 21.00 was fixed:
7zip could not correctly extract some ZIP archives created with xz compression method.
Some bugs were fixed.

7zip 21.00 alpha

2021-01-19

Some internal changes in code.
Some bugs were fixed.
New localizations: Tajik, Uzbek (Cyrillic)

7zip 20.02 alpha

2020-08-08

The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.
It allows to increase the compression speed for big 7z archives, if there is a big number
of CPU cores and threads.
The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives.
The new -ssp switch. If the switch -ssp is specified, 7zip doesn't allow the system
to modify "Last Access Time" property of source files for archiving and hashing operations.
Some bugs were fixed.
New localization: Swahili.

7zip 20.00 alpha

2020-02-06

7zip now supports new optional match finders for LZMA/LZMA2 compression: bt5 and hc5,
that can work faster than bt4 and hc4 match finders for the data with big redundancy.
The compression ratio was improved for Fast and Fastest compression levels with the
following default settings:
- Fastest level (-mx1) : hc5 match finder with 256 KB dictionary.
- Fast level (-mx3) : hc5 match finder with 4 MB dictionary.
Minor speed optimizations in multithreaded LZMA/LZMA2 compression for Normal/Maximum/Ultra
compression levels.
bzip2 decoding code was updated to support bzip2 archives, created by lbzip2 program.
Some bugs were fixed.
New localization: Turkmen.

7zip 19.02 alpha

2019-09-05

7zip now can unpack files encoded with Base64 encoding (b64 filename extension).
7zip now can use new x86/x64 hardware instructions for SHA-1 and SHA-256, supported
by AMD Ryzen and latest Intel CPUs: Ice Lake and Goldmont.
It increases
- the speed of SHA-1/SHA-256 hash value calculation,
- the speed of encryption/decryption in zip AES,
- the speed of key derivation for encryption/decryption in 7z/zip/rar archives.
The speed of zip AES encryption and 7z/zip/rar AES decryption was increased with
the following improvements:
- 7zip now can use new x86/x64 VAES (AVX Vector AES) instructions, supported by
Intel Ice Lake CPU.
- The existing code of x86/x64 AES-NI was improved also.
There is 2% speed optimization in 7zip benchmark's decompression.
Some bugs were fixed.

7zip 19.00

2019-02-21

Encryption strength for 7z archives was increased:
the size of random initialization vector was increased from 64-bit to 128-bit,
and the pseudo-random number generator was improved.
Some bugs were fixed.

7zip 18.06

2018-12-30

The speed for LZMA/LZMA2 compressing was increased by 3-10%,
and there are minor changes in compression ratio.
Some bugs were fixed.
The bug in 7zip 18.02-18.05 was fixed: there was memory leak in xz decoder.
7zip 18.02-18.05 used only one CPU thread for bz2 archive creation.

7zip 18.05

2018-04-30

The speed for LZMA/LZMA2 compressing was increased
by 8% for fastest/fast compression levels and
by 3% for normal/maximum compression levels.
7zip now shows Properties (Info) window and CRC/SHA results window
as "list view" window instead of "message box" window.
Some improvements in zip, hfs and dmg code.
Previous versions of 7zip could work incorrectly in "Large memory pages" mode in
Windows 10 because of some BUG with "Large Pages" in Windows 10.
Now 7zip doesn't use "Large Pages" on Windows 10 up to revision 1709 (16299).
The vulnerability in RAR unpacking code was fixed (CVE-2018-10115).
Some bugs were fixed.

7zip 18.03 beta

2018-03-04

The speed for single-thread LZMA/LZMA2 decoding
was increased by 30% in x64 version and by 3% in x86 version.
7zip now can use multi-threading for 7z/LZMA2 decoding,
if there are multiple independent data chunks in LZMA2 stream.
7zip now can use multi-threading for xz decoding,
if there are multiple blocks in xz stream.
New localization: Kabyle.
Some bugs were fixed.

7zip 18.01

2018-01-28

7zip now can unpack DMG archives that use LZFSE compression method.
7zip now doesn't allow update operation for archives that have read-only attribute.
The BUG was fixed:
extracting from tar with -si switch didn't set timestamps for directories.
Some bugs were fixed.

7zip 18.00 beta

2018-01-10

7zip now can unpack OBJ/COFF files.
new -sse switch to stop archive creating, if 7zip can't open some input file.
Some bugs were fixed.

7zip 17.01 beta

2017-08-28

Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
7zip now uses additional memory buffers for multi-block LZMA2 compression.
CPU utilization was slightly improved.
7zip now creates multi-block xz archives by default. Block size can be
specified with -ms[Size]{m|g} switch.
xz decoder now can unpack random block from multi-block xz archives.
7zip File Manager now can open nested multi-block xz archives
(for example, image.iso.xz) without full unpacking of xz archive.
7zip now can create zip archives from stdin to stdout.
7zip command line: @listfile now doesn't work after -- switch.
Use -i@listfile before -- switch instead.
The BUGs were fixed:
7zip could add unrequired alternate file streams to WIM archives,
for commands that contain filename wildcards and -sns switch.
7zip 17.00 beta crashed for commands that write anti-item to 7z archive.
7zip 17.00 beta ignored "Use large memory pages" option.

7zip 17.00 beta

2017-04-29

ZIP unpacking code was improved.
7zip now reserves file space before writing to file (for extraction from archive).
It can reduce file fragmentation.
Some bugs were fixed. 7zip could crash in some cases.
Internal changes in code.

7zip 16.04

2016-10-04

The bug was fixed: 7zip 16.03 exe installer under Vista didn't create
links in Start / Programs menu.
Some bugs were fixed in RAR code.

7zip 16.03

2016-09-28

Installer and SFX modules now use some protection against DLL preloading attack.
Some bugs were fixed in 7z, NSIS, SquashFS, RAR5 and another code.

7zip 16.02

2016-05-21

7zip now can extract multivolume ZIP archives (z01, z02, ... , zip).
Some bugs were fixed.

7zip 15.14

2015-12-31

7zip File Manager:
- The code for "Open file from archive" operation was improved.
- The code for "Tools/Options" window was improved.
- The BUG was fixed: there was incorrect mouse cursor capture for
drag-and-drop operations from open archive to Explorer window.
Some bugs were fixed.
New localization: Yoruba.

7zip 15.12

2015-11-19

The release version.

7zip 15.11 beta

2015-11-14

Some bugs were fixed.

7zip 15.10 beta

2015-11-01

The BUG in 9.21 - 15.09 was fixed:
7zip could ignore some parameters, specified for archive creation operation
for gzip and bzip2 formats in "Add to Archive" window and in command line
version (-m switch).
Some bugs were fixed.

7zip 15.09 beta

2015-10-16

7zip now can extract ext2 and multivolume VMDK images.
Some bugs were fixed.

7zip 15.08 beta

2015-10-01

7zip now can extract ext3 and ext4 (Linux file system) images.
Some bugs were fixed.

7zip 15.07 beta

2015-09-17

7zip now can extract GPT images and single file QCOW2, VMDK, VDI images.
7zip now can extract solid WIM archives with LZMS compression.
Some bugs were fixed.

7zip 15.06 beta

2015-08-09

7zip now can extract RAR5 archives.
7zip now doesn't sort files by type while adding to solid 7z archive.
new -mqs switch to sort files by type while adding to solid 7z archive.
The BUG in 7zip File Manager was fixed:
The "Move" operation to open 7z archive didn't delete empty files.
The BUG in 15.05 was fixed:
console version added some text to the end of stdout stream, is -so switch was used.
The BUG in 9.30 - 15.05 was fixed:
7zip could not open multivolume sfx RAR archive.
Some bugs were fixed.

7zip 15.05 beta

2015-06-14

7zip now uses new installer.
7zip now can create 7z, xz and zip archives with 1536 MB dictionary for LZMA/LZMA2.
7zip File Manager now can operate with alternate file streams at NTFS
volumes via "File / Alternate Streams" menu command.
7zip now can extract .zipx (WinZip) archives that use xz compression.
new optional "section size" parameter for BCJ2 filter for compression ratio improving.
Example: -mf=BCJ2:d9M, if largest executable section in files is smaller than 9 MB.
Speed optimizations for BCJ2 filter and SHA-1 and SHA-256 calculation.
Console version now uses stderr stream for error messages.
Console version now shows names of processed files only in progress line by default.
new -bb[0-3] switch to set output log level. -bb1 shows names of processed files in log.
new -bs[o|e|p][0|1|2] switch to set stream for output messages;
o: output, e: error, p: progress line; 0: disable, 1: stdout, 2: stderr.
new -bt switch to show execution time statistics.
new -myx[0-9] switch to set level of file analysis.
new -mmtf- switch to set single thread mode for filters.
The BUG was fixed:
7zip didn't restore NTFS permissions for folders during extracting from WIM archives.
The BUG was fixed:
The command line version: if the command "rn" (Rename) was called with more
than one pair of paths, 7zip used only first rename pair.
The BUG was fixed:
7zip crashed for ZIP/LZMA/AES/AES-NI.
The BUG in 15.01-15.02 was fixed:
7zip created incorrect ZIP archives, if ZipCrypto encryption was used.
7zip 9.20 can extract such incorrect ZIP archives.
Some bugs were fixed.

7zip 9.38 beta

2015-01-03

Some bugs were fixed.

7zip 9.36 beta

2014-12-26

The BUG in command line version was fixed:
7zip created temporary archive in current folder during update archive
operation, if -w{Path} switch was not specified.
The fixed 7zip creates temporary archive in folder that contains updated archive.
The BUG in 9.33-9.35 was fixed:
7zip silently ignored file reading errors during 7z or gz archive creation,
and the created archive contained only part of file that was read before error.
The fixed 7zip stops archive creation and it reports about error.
Some bugs were fixed.

7zip 9.35 beta

2014-12-07

The BUG was fixed:
7zip crashed during ZIP archive creation, if the number of CPU threads was more than 64.
The BUG in 9.31-9.34 was fixed:
7zip could not correctly extract ISO archives that are larger than 4 GiB.
The BUG in 9.33-9.34 was fixed:
The option "Compress shared files" and -ssw switch didn't work.
The BUG in 9.26-9.34 was fixed:
7zip File Manager could crash for some archives open in "Flat View" mode.
Some bugs were fixed.

7zip 9.34 alpha

2014-06-22

The BUG in 9.33 was fixed:
Command line version of 7zip could work incorrectly, if there is relative
path in exclude filename optiton (-x) and absolute path as include filename.
The BUG in 9.26-9.33 was fixed:
7zip could not open some unusual 7z archives that were created by another
software (not by 7zip).
The BUG in 9.31-9.33 was fixed:
7zip could crash with switch -tcab.

7zip 9.33 alpha

2014-06-15

7zip now can show icons for 7zip items in Explorer's context menu.
"Add to archive" dialog box:
- new options in "Path Mode"
- new option "Delete files after compression"
- new "NTFS" options for WIM and TAR formats:
- Store symbolic links
- Store hard links
- Store alternate data streams
- Store file security
"Extract" dialog box:
- new optional field to set output folder name
- new option "Eliminate duplication of root folder"
- new option "Absolute pathnames" in "Path Mode".
- new option "Restore file security" (that works for WIM archives only)
7zip File Manager:
- new "File / Link" dialog box in to create symbolic links and hard links.
Command line version:
- new -spd switch to Disable wildcard matching for file names
- new -spe switch to Eliminate duplication of root folder for extract archive command
- new -snh switch to store hard links as links (WIM and TAR formats only)
- new -snl switch to store symbolic links as links (WIM and TAR formats only)
NSIS support was improved.
The problem was fixed:
The command "extract to \*" with multiple archives could use same
output folder, if archives are placed inside PE (EXE) file.
The BUG of 9.31-9.32 was fixed:
Command line version for test and extract commands returned the
value 0 as exit code, if it couldn't open archive.
The BUG was fixed:
7zip could not create archives with anti-items for any archive type,
except of 7z type
Some bugs were fixed.
New localization: Mongolian (script).

7zip 9.32 alpha

2013-12-01

7zip now can create multivolume SFX archives in 7z format.
Standalone sfx module now can unpack external 7z archive with name that is
matched to name of sfx module. For example, sfx module renamed to archive.exe
can unpack archive.7z or archive.7z.001 .
ZIP, NSIS, HFS, AR support was improved.
7zip now supports files larger than 4 GiB in ISO archives.
Improved compression ratio in 7z format with maximum or ultra level for
executable files (EXE and DLL) that are larger than 16 MB (improved BCJ2 filter).
Improved support for file pathnames longer than 260 characters.
CRC and SHA checksum calculation for files can be called via Explorer's context menu.
7zip File Manager now also takes into account the numbers in filenames for sorting order.
7zip File Manager now can use RAM buffers instead of temp files to open
nested archives, if temp file is smaller than 1/4 of RAM size.
7zip File Manager can open files in "Parser" mode via "Open Archive > #" context
menu command. It shows the list of archives inside file.
Command line version:
- new -t# switch to open file in "Parser" mode and show the list of archives inside file.
- new -stx{Type} switch to exclude archive type from using.
- -scs switch now supports UTF-16 encoding.
- now it shows time and memory usage statistics at the end of execution.
The BUGs were fixed:
- 7zip 9.30 and early versions created ZIP archives with minor errors
in extra field of headers for directory items, if AES (WinZip-AES) encryption was used.
- 7zip could work incorrectly in decompression of more than one
multi-volume archive in one command.
- 7zip 9.24 alpha - 9.30 alpha versions could not extract ZIP archives
encrypted with PKWARE-AES method.
Minimum supported system now is Windows 2000. 7zip doesn't work on Windows 95/98/ME.
New localization: Irish.

7zip 9.30 alpha

2012-10-26

LZMA2 now is default compression method for .7z format.
7zip now can update WIM archives.
7zip File Manager now can move files to archives.
The default encoding for TAR format now is UTF-8. You can use -mcp=1 switch for OEM encoding.
Command line version:
- new "rn" command to rename files in archive.
- new -sdel switch to delete files after including to archive.
- new -sns switch to store NTFS alternate streams (for WIM format only).
- new -sni switch to store NT security information for files (for WIM format only).
- new -stl switch to set archive timestamp from the most recently modified file.
Speed optimizations for opening big archives and big disk folders.
7zip now writes special padding blocks to headers of 7z archives for
faster archive opening. Note that 7zip 4.50 - 4.58 contain BUG,
so these old versions can't correctly work with such new 7z archives.
DMG support was improved
Some bugs were fixed.
The BUG in 7zip 9.26 alpha - 9.29 alpha versions was fixed.
These alpha versions could not open non-solid 7z archive, if
some files were skipped during creation of that archive.
That problem is also related to 7z archives created in solid mode,
if each solid block contains no more than one file.
Note: 7zip skips files that were open for writing by another
application and shows warning in that case.
New localization: Aragonese.

7zip 9.25 alpha

2011-09-16

LZMA decompression speed was improved.
"compress and send to email" code was improved to support more email clients.
New command "h" to calculate hash values CRC-32, CRC-64, SHA-256 or SHA-1 for files on disk.
New -spf switch to store full file paths including drive letter to archive.
If you use that switch with extract command, please check that file names in archive are correct.
Some bugs were fixed.

7zip 9.23 alpha

2011-06-07

The format of language files was changed.
Some bugs were fixed.
New localization: Karakalpak.

7zip 9.22 beta

2011-04-18

7zip now uses progress indicator displayed on a taskbar button under Windows 7.
The BUG in 7zip 9.21 beta was fixed:
7zip could ignore some options when you created ZIP archives.
For example, it could use ZipCrypto cipher instead of AES-256.

7zip 9.21 beta

2011-04-11

7zip now can unpack UEFI BIOS files.
64-bit version of 7zip now includes additional 32-bit shell extension DLL.
So other 32-bit programs can call 64-bit 7zip via context menu.
Now it's possible to associate 7zip with file types without Administrator rights.
New -mf=FilterID switch to specify compression filter. Examples:
7z a -mf=bcj2 a.7z a.tar
7z a -mf=delta:4 a.7z a.wav
7z a -mf=bcj a.tar.xz a.tar
32-bit 7zip running under 64-bit Windows now can use up to 4 GB of RAM.
Some bugs were fixed.
New localizations: Corsican, Kyrgyz, Ligurian.

7zip 9.20

2010-11-18

Some bugs were fixed.

7zip 9.19 beta

2010-11-11

The console version now doesn't show entered password.
Some bugs were fixed.

7zip 9.18 beta

2010-11-02

7zip now can unpack SquashFS and CramFS filesystem images.
7zip now can unpack some TAR and ISO archives with incorrect headers.
New small SFX module for installers (in Extra package).
Some bugs were fixed.

7zip 9.17 beta

2010-10-04

Disk fragmentation problem for ZIP archives created by 7zip was fixed.

7zip 9.16 beta

2010-09-08

7zip now supports files that are larger than 8 GB in TAR archives.
NSIS support was improved.
Some bugs were fixed.
New localizations: Hindi, Gujarati, Sanskrit.

7zip 9.15 beta

2010-06-20

Some bugs were fixed.
New localization: Tatar.

7zip 9.14 beta

2010-06-04

WIM support was improved.

7zip 9.13 beta

2010-04-15

7zip now stores NTFS file timestamps to ZIP archives.
New additional "Open archive >" item in context menu allows to select
archive type for some files.
Some bugs were fixed.
New localization: Uyghur.

7zip 9.12 beta

2010-03-24

ZIP / PPMd compression ratio was improved in Maximum and Ultra modes.
The BUG in 7zip 9.* beta was fixed: LZMA2 codec didn't work,
if more than 10 threads were used (or more than 20 threads in some modes).

7zip 9.11 beta

2010-03-15

7zip now supports PPMd compression in ZIP archives.
Speed optimizations in PPMd codec.
The support for archives in installers was improved.
Some bugs were fixed.
New localization: Kazakh.

7zip 9.10 beta

2009-12-22

The BUG in 7zip 9.09 beta was fixed:
7zip created incorrect ZIP archives, if ZipCrypto encryption was used.

7zip 9.09 beta

2009-12-12

7zip now can unpack Apple Partition Map (APM) disk images.
Speed optimizations in AES code for Intel's 32nm CPUs.
Speed optimizations in CRC calculation code for Intel's Atom CPUs.
Some bugs were fixed.

7zip 9.07 beta

2009-08-27

It's possible to specify Diff program in options (7zip File Manager).
Some bugs were fixed.

7zip 9.06 beta

2009-08-17

7zip now can unpack MSLZ archives.
Partial parsing for EXE resources, SWF and FLV.
Some bugs were fixed.

7zip 9.04 beta

2009-05-30

7zip now can update solid .7z archives.
7zip now supports LZMA2 compression method.
7zip now supports XZ archives.
7zip now can unpack NTFS, FAT, VHD and MBR archives.
7zip now can unpack GZip, BZip2, LZMA, XZ and TAR archives from stdin.
7zip now can open/copy/compress disk images (like \\.\c:) from \\.\ folder.
7zip File Manager now doesn't use temp files to open nested archives
stored without compression.
New -scrc switch to calculate total CRC-32 during extracting / testing.
New -scc{WIN|DOS|UTF-8} switch to specify charset for console input/output (default = DOS).
Some bugs were fixed.

7zip 4.65

2009-02-03

7zip File Manager now can calculate SHA-256 checksum.
Some bugs were fixed.

7zip 4.64

2009-01-03

The bug in 7zip 4.63 was fixed: 7zip could not decrypt .ZIP archives
encrypted with WinZip-AES method.

7zip 4.63

2008-12-31

7zip now can unpack ZIP archives encrypted with PKWARE-AES.
Some bugs were fixed.

7zip 4.62

2008-12-02

Some bugs were fixed.

7zip 4.61 beta

2008-11-23

7zip now supports LZMA compression for .ZIP archives.
Some bugs were fixed.
New localization: Sinhala.

7zip 4.60 beta

2008-08-19

Some bugs were fixed.

7zip 4.59 beta

2008-08-13

7zip now can unpack UDF, XAR and DMG/HFS archives.
7zip File Manager now keeps encryption when you edit encrypted file inside archive.
7zip File Manager now allows to change current folder from the address bar drop-down list.
It's allowed to use -t switch for "list" and "extract" commands.
Some bugs were fixed.
New localizations: Icelandic, Kurdish Sorani.

7zip 4.58 beta

2008-05-05

Some speed optimizations.
7zip now can unpack .lzma archives.
Unicode (UTF-8) support for filenames in .ZIP archives. Now there are 3 modes:
1) Default mode: 7zip uses UTF-8, if the local code page doesn't contain required symbols.
2) -mcu switch: 7zip uses UTF-8, if there are non-ASCII symbols.
3) -mcl switch: 7zip uses local code page.
Now it's possible to store file creation time in 7z and ZIP archives (-mtc switch).
7zip now can unpack multivolume RAR archives created with
"old style volume names" scheme and names *.001, *.002, ...
Now it's possible to use -mSW- and -mSW+ switches instead of -mSW=off and -mSW=on
Some bugs were fixed.
New localizations: Punjabi (Indian), Pashto.

7zip 4.57

2007-12-06

The BUG in command line version was fixed: -up3 switch
could work incorrectly.

7zip 4.56 beta

2007-10-24

Some bugs were fixed.

7zip 4.55 beta

2007-09-05

Some bugs were fixed.

7zip 4.54 beta

2007-09-04

Decompression speed was increased.

7zip 4.53 beta

2007-08-27

"Test" and "Info" buttons now work for open archives.
The bug in 7zip 4.48 - 4.52 beta was fixed:
7zip could create .ZIP archives with broken files.
Some bugs were fixed.

7zip 4.52 beta

2007-08-03

7zip now can unpack Compound files (msi, doc, ...).
Some bugs were fixed.

7zip 4.51 beta

2007-07-25

Bug was fixed: 7zip 4.50 beta could not open some .7z archives.

7zip 4.50 beta

2007-07-24

New switch for command line version:
-ssc[-] enables/disables case-sensitive mode for file names.
Speed optimizations for AES encryption.
Some bugs were fixed.

7zip 4.49 beta

2007-07-11

7zip now can unpack WIM archives.
7zip now replaces incorrect characters in filenames during extracting.

7zip 4.48 beta

2007-06-26

Encryption strength for .7z format was increased.
Now it uses random initialization vectors.
Some bugs were fixed.

7zip 4.47 beta

2007-05-27

Bugs of 7zip 4.46 beta were fixed: BZip2 could work incorrectly.

7zip 4.46 beta

2007-05-25

New fast compression mode for Deflate method in Zip and GZip.
New "Compress shared files" option in GUI and -ssw switch.
Some bugs were fixed.
New localization: Norwegian Nynorsk.

7zip 4.45 beta

2007-04-17

Now it's possible to specify the size of solid block and the number
of CPU threads in "Add to archive" dialog box.
Default dictionary size was increased: Normal: 16 MB, Max: 32 MB.
Speed optimizations.
Benchmark was improved (new "b" command in command line version).
The number of DLL files was reduced.
Now it's possible to associate 7zip with combined types like .tbz2
switch -mhcf=off is not supported now.
If -t{Type} switch is not specified, 7zip now uses extension of archive to
detect the type of archive.
Some bugs were fixed.
New localization: Welsh.

7zip 4.44 beta

2007-01-20

Speed optimizations for LZMA, Deflate, BZip2 and unRAR.
7zip now supports file pathnames longer than 260 characters.
Some bugs were fixed.
New localizations: Bangla, Bashkir, Nepali.

7zip 4.43 beta

2006-09-15

7zip now can use multi-threading mode for compressing to .ZIP archives.
ZIP format supporting was improved.
7zip now supports WinZip-compatible AES-256 encryption for .ZIP archives.
New context menu items for .ZIP archives creating.
7zip now uses order list (list of extensions) for files sorting for compressing
to .7z archives. It can slightly increase compression ratio in some cases.
7zip now restores modification time of folders during .7z archives extracting.
Some bugs were fixed.
New localizations: Armenian, Marathi.

7zip 4.42

2006-05-14

Compressing speed and Memory requirements were increased.
Default dictionary size was increased: Fastest: 64 KB, Fast: 1 MB,
Normal: 4 MB, Max: 16 MB, Ultra: 64 MB.
BZip2 compressing / decompressing now can work in multi-threading mode
Multi-threading mode now is default for multi-processor systems
64-bit version now supports 1 GB dictionary
7z/LZMA now can use only these match finders: HC4, BT2, BT3, BT4
Compression ratio in Zip/GZip/Deflate in Ultra mode was increased
7zip now can unpack ISO archives and some installers created by NSIS
Optional "Flat View" mode in 7zip File Manager
7zip File Manager now can calculate CRC checksums for files
-x switch with relative paths now affects files specified with absolute paths
New switch for 7za.exe (console version): -slt.
"l" (list) command with -slt shows technical information for archive.
New switch: -scs{WIN|DOS|UTF-8} specifies charset for list files.
Default charset for list files is UTF-8 now.
Some bugs were fixed
New localizations: Albanian, Kurdish

7zip 4.32

2005-12-09

Bug was fixed: 7zip 4.31 didn't work in Windows 95

7zip 4.31

2005-12-04

Small changes
New localization: Basque

7zip 4.30 beta

2005-11-18

Files 7zFMn.exe, 7zGn.exe, 7zipn, 7za.exe, 7zC.sfx were removed from 7zip package
7zip now uses uncompressed SFX: 7z.sfx
Sfx modules 7z.sfx and 7zCon.sfx now use msvcrt.dll
Speed optimizations in LZMA maximum/ultra compressing.
LZMA now supports word size up to 273
7zip now reduces dictionary size for LZMA, if you compress files
smaller than specified dictionary size.
7zip now can use large memory pages:
GUI: 7zip File Manager / Options / Settings / Use large memory pages.
Command line version: -slp switch.
This feature allows to increase speed of compressing.
But 7zip can make some pause at starting of compressing for allocating large pages.
Also Task Manager doesn't show real memory usage of program, if 7zip uses large pages.
This feature works only on Windows 2003 / XP x64 / Vista.
Also you must have administrator's rights for your system.
Recommended size of RAM: 1 GB or more.
To install this feature you must run 7zip File Manager at least once,
close it and reboot system.
Some bugs were fixed

7zip 4.29 beta

2005-09-28

Bug was fixed: 7zip 4.28 beta worked incorrectly in Windows 95/98/Me

7zip 4.28 beta

2005-09-27

Bug was fixed: 7zip 4.27 beta created incorrect multivolume archives.
"Duplicate filename" collision problem between names with ligatures was fixed.

7zip 4.27 beta

2005-09-21

7zip can unpack CHM/HXS (MS HTML HELP) archives
7zip can unpack multivolume CAB archives
Now 7zip deletes files to the Recycle Bin by default.
Shift+Delete deletes files permanently.
Some bugs were fixed
New localization: Tatarish

7zip 4.26 beta

2005-08-05

LZH format support (extracting only)
Some bugs were fixed
New localization: Ido

7zip 4.25 beta

2005-07-31

7zip now doesn't interrupt the compressing when it can not
find specified file as in version 4.24 beta. It just shows warning.
7zip now supports standard selection mode in the file list
Some bugs were fixed

7zip 4.24 beta

2005-07-06

7zip now supports right-click Drag and Drop in Explorer
Command line version now supports short file names (like FILENA~1.TXT)
If there are no wildcard names and there is no -r switch in command line,
7zip now checks that specified files exist on disk before compressing.
Some bugs were fixed

7zip 4.23

2005-06-29

Drag and Drop support
7zip File Manager now can copy files from one archive to another
Some bugs were fixed
New localizations: Extremaduran, Malay

7zip 4.20

2005-05-30

No changes

7zip 4.19 beta

2005-05-21

BZip2 code was rewritten. Now it supports 3 modes: Normal, Maximum and
Ultra. In Normal mode it compresses almost as original BZip2 compressor.
Compression ratio in Maximum and Ultra modes is 1-3% better for some files,
but Maximum Mode is about 3 times slower and Ultra Mode is about 8 times
slower than Normal mode.
Console version now prints all messages to stdout by default,
and if -so switch is specified, 7zip prints messages to stderr.
Some bugs were fixed
New localizations: Azeri, Georgian

7zip 4.18 beta

2005-04-19

Bug in v4.17 beta was fixed: 7zip File Manager could crash
after some operations with archives

7zip 4.17 beta

2005-04-18

To increase protection from viruses, 7zip now does not open
files with more than 4 continuous spaces in the name.
And 7zip changes such long spaces in name to " ... " in the file list.
Code size optimization
Some files were moved from main package to extra package:
- Plugin for FAR Manager
- SFX modules for installers (7zS.sfx and 7zSD.sfx)
New localizations: Asturian, Indonesian

7zip 4.16 beta

2005-03-29

Speed optimization (5%) for 7z / LZMA
7za.exe now supports .Z archives
-r- switch in command line now is default for all commands
Some bugs were fixed
New localization: Uzbek

7zip 4.15 beta

2005-01-25

Z format supporting (extracting only)
7zip now can extract ZIP archives compressed with "Shrink" method
7zip now doesn't interrupt the compressing when it can not open file.
7zip just skips that file and shows warning.
Some bugs were fixed
New localization: Frisian

7zip 4.14 beta

2005-01-11

7zip installer was created with NSIS.
Now it installs 7zip for all users (under Windows 2000/XP).
Now 7zip can create multivolume archives
(switch -v for command line)
Some bugs were fixed
New localizations: Breton, Farsi

7zip 4.13 beta

2004-12-14

Switch "--" stops switches parsing
Some bugs were fixed

7zip 4.12 beta

2004-11-18

Bug in v4.11 beta was fixed:
7zip created incorrect ZIP archives if file size was
from 3.75 GB to 4 GB.

7zip 4.11 beta

2004-11-16

7zip now shows file names during compressing/decompressing
7zip now supports Zip64 extension of ZIP format. So now it's
possible to compress files bigger than 4 GB to ZIP archives.
Some bugs were fixed
New localization: Galician

7zip 4.10 beta

2004-10-21

Bugs in v4.0* were fixed:
- Some commands in command line with "-r" switch worked incorrectly,
so 7zip could skip some files during compressing
- Some other bugs were fixed
Small internal changes

7zip 4.09 beta

2004-10-05

Bugs in v4.0* were fixed:
- Renaming inside archives didn't work or worked incorrectly
- GUI SFX didn't show extracting dialog at start
Small fixes in 7zip GUI (7zG.exe)

7zip 4.08 beta

2004-10-04

Bug in installer for v4.07 was fixed: when rebooting
is required, it rebooted without asking user
Small fixes in 7zip GUI (7zG.exe)

7zip 4.07 beta

2004-10-03

Big amount of code was changed in this beta version.
So don't use it for important data compressing.
And test archive after compressing.
Unified command line interface to GUI and console versions
7zip now can extract or test several archives in one command
7zip now doesn't interrupt the compressing when file is locked by
other application. 7zip just skips that file and shows warning.
Note: previous versions of 7zip had bug, so they can not unpack
non-solid and some solid 7z archives with such skipped files.
Command line interface was changed:
- now it's possible to use absolute pathnames
- syntax simplification:
was: 7z a a Folder1\* Folder2\* -r
now: 7z a a Folder1 Folder2
- now it's possible to use complex wildcard commands, like *\*111*\*
More smart detection of archive type for files with unusual
file name extensions
Supporting for RAR archives with encrypted headers
CPIO format supporting was improved
For GZip and BZip2 formats you can:
- Compress from stdin (-si switch)
- Compress to stdout (-so switch)
- Extract to stdout (-so switch)
7zip File Manager:
- Split and Combine commands
- new list view options: Full row select, Show grid lines
Internal reconstruction
Some bugs were fixed
New localizations: Friulian, Macedonian, Mongolian, Tamil, Thai

7zip 3.13

2003-12-11

Some small bugs were fixed

7zip 3.12

2003-12-10

Now you can select compression method, dictionary size
and word size in "Add to archive" dialog box. Also it
shows memory usage.
7zip File Manager now contains toolbars.
New "Benchmark" command in 7zip File Manager.
It measures compressing and decompressing speeds and
shows rating values.
Some bugs were fixed.

7zip 3.11

2003-10-06

7zip now use limitations for solid block size
for increasing the speed of random file decompressing:
- in Store mode: 0 B
- in Fast mode: 16 MB
- in Normal mode: 256 MB
- in Maximum mode: 1 GB
- in Ultra mode: 4 GB
7z.exe, 7za.exe and SFX modules now support Unicode
file names under Windows NT/2000/XP/2003.
7zn.exe and 7zan.exe were removed from package.
Some bugs were fixed
New localization: Afrikaans

7zip 3.10

2003-09-27

Drag-and-Drop from external application
GUI version (7zG.exe) can compress files with absolute paths
Compression dialog doesn't suggest bzip2 and gzip2 types when
there are more than one selected file
Optional auto renaming for existing files during extraction
in command line version (-aot switch).
Some bugs were fixed

7zip 3.09.02

2003-09-20

Optional limitation for solid block size for increasing
the speed of random file decompressing (-ms switch)

7zip 3.09.01 beta

2003-09-06

Automatic compression filter for executable files:
dll, exe, ocx, sfx, sys, (-mf switch)
Compression levels in 7z now are:
- Fast: 32 KB dictionary, BCJ filter
- Normal: 2 MB dictionary, BCJ filter
- Maximum: 8 MB dictionary, BCJ filter, max settings
- Ultra: 32 MB dictionary, BCJ2 filter, max settings
Updating solid 7z archives now is supported, if it doesn't
require repacking solid blocks
-mhcf switch for 7z format now is default
Some bugs were fixed

7zip 3.08.04 beta

2003-08-24

Favorites menu in 7zip File Manager
Some bugs were fixed

7zip 3.08.03 beta

2003-08-21

Automatic adding of extension to archive name in Compress Dialog
Some bugs in previous 3.08.* versions were fixed:
- Storing columns width inside archives in File Manager
- Opening archive inside archive
- Quotes in list files in console version

7zip 3.08.02 beta

2003-08-20

Some bugs were fixed

7zip 3.08 beta

2003-08-19

Compress dialog:
- Supporting fast compressing mode (-mx=1 switch)
- Multi-threading option for Multi-Processor systems
or Pentium 4 with Hyper-Threading
- Encrypt file names option
New context menu items:
- Extract here
- Extract to <Folder>
- Compress and email
Internal reconstruction, registry using was reduced
New localization: Esperanto

7zip 2.30 Beta 32

2003-05-15

New features in compressing / decompressing window.
"Show password" option.
Some other small changes.
New localization: Valencian.

7zip 2.30 Beta 31

2003-04-29

Some bugs were fixed.

7zip 2.30 Beta 30

2003-04-19

7zip File Manager:
- Showing .. item.
- 1/2 Panels mode switching (F9).
Supporting Bzip2 compression in ZIP archives.
Some bugs were fixed.
Some optimization recompiling for reducing code size.

7zip 2.30 Beta 29

2003-04-07

7zip File Manager:
- "7zip" and "System" submenus in "Files" menu.
- Path history and "Browse" button in "Copy" dialog.
RAR supporting was improved.
Some bugs were fixed.
Small changes in LZMA code.
New localizations: Hebrew, Vietnamese.

7zip 2.30 Beta 28

2003-02-16

Some bugs were fixed:
- Updating 7z archives that are larger than 4 GB.
- Using anti-items in 7z format.
- Compressing empty files with password to zip format.
In max mode 7z now uses 8 MB dictionary instead of 4 MB.
7zip File Manager:
- Supporting file comments: Ctrl-Z.
- New key alias for folder bookmarks: [Shift]+Alt+Number.

7zip 2.30 Beta 27

2003-01-24

Two BUGs in two previous beta versions (Beta 25 and Beta 26)
were fixed:
1. Incorrect compressing to non-solid 7z archive
when files have some very big sizes:
4 GB, 8 GB, 12 GB, 16 GB, ...
2. Incorrect percent showing in 7z compressing
when files are bigger than 4 GB.
Supporting multivolume RAR and SPLIT archives.
Supporting DEB archives.
Supporting old version of CPIO format.
Some bugs were fixed.
New localizations: Korean, Swedish.

7zip 2.30 Beta 26

2003-01-12

Supporting Deflate64 method in Zip archives.
Supporting Rar 1.50 archives.
Some bugs were fixed.

7zip 2.30 Beta 25

2003-01-02

Encryption feature for 7z format (AES-256).
New optional archive header compressing mode (-mhcf).
Archive headers now always are compressed with LZMA method.
Updating non-solid 7z archives without -ms=off now is allowed.
Folder creating and item renaming inside archive now is supported.
Supporting encrypted Rar3 archives.
Supporting Unicode names in Rar3 archives.
Some bugs were fixed.
New localizations: Lithuanian, Voro.

7zip 2.30 Beta 24

2002-11-01

Some internal reconstructions.
-m switch syntax was slightly changed.
Some bugs were fixed.
New localizations: Catalan, Norwegian, Romanian.

7zip 2.30 Beta 23

2002-09-07

Encryption feature for zip format.
Percent indicating for some operations.
Some bugs were fixed.

7zip 2.30 Beta 22

2002-08-31

New program: 7zip File Manager.
Command line version now doesn't allow absolute paths
for compressing files.
New localizations: Belarusian, Greek.
Bug in FAR plugin was fixed:
Incorrect updating when archive has no explicit
directory items for file items.
Some bugs were fixed.

7zip 2.30 Beta 21

2002-07-08

RAM requirements for LZMA (7z) compression were reduced.
Small bug in FAR plugin was fixed.

7zip 2.30 Beta 20

2002-07-01

RAM requirements for LZMA (7z) decompression were reduced.
New localization: Turkish.
Some bugs were fixed.

7zip 2.30 Beta 19

2002-04-11

Supporting RAR 3.0 archives.
New localizations: Danish, Ukrainian.

7zip 2.30 Beta 18

2002-03-25

Compressing speed in 7z format was slightly increased.
New localizations: Estonian, Finnish.
Some bugs were fixed.

7zip 2.30 Beta 17

2002-03-03

Supporting ARJ archives.
New localization: Chinese Simplified.

7zip 2.30 Beta 16

2002-02-24

Supporting RPM and CPIO archives.
New fast compression mode for LZMA: -m0a=0.
New match finders for LZMA: bt4b, hc3, hc4.
Some bugs were fixed.

7zip 2.30 Beta 15

2002-02-17

Compression ratio in 7z was slightly improved.
New localization: Dutch.

7zip 2.30 Beta 14

2002-02-10

Speed optimization for multiprocessor computers (-mmt switch).
New localizations: Czech, Japanese, Polish.
Some bugs were fixed.

7zip 2.30 Beta 13

2002-01-31

New SFX module for installers.
New match finder for LZMA: bt3.
New localizations: Portuguese, Portuguese Brazil, Serbo-Croatian.
Some bugs were fixed.

7zip 2.30 Beta 12

2002-01-16

Bug was fixed: memory leak in Beta 11.
New localization: Hungarian.

7zip 2.30 Beta 11

2002-01-15

Archive testing feature for GUI version.
Now 7zip can use more than 256 MB of RAM in all Windows versions.
New localizations: Bulgarian, Chinese Traditional, Latvian, Slovak.
Some bugs were fixed.

7zip 2.30 Beta 10

2002-01-11

Bugs were fixed:
- Updating 7z archives in Beta 8 and 9 didn't work.
- Unicode version in Beta 9 didn't work in Windows NT4.
- Some other bugs were fixed.
New localizations: Arabic, French, Italian, Slovenian, Spanish.

7zip 2.30 Beta 9

2002-01-08

Program localization: English, German, Russian.
Additional optimized versions of programs
for Windows NT4/2000/XP.
Two new match finders for LZMA: pat3h and pat4h.
Some bugs were fixed.

7zip 2.30 Beta 8

2001-12-21

7zip now supports some zip archives that were not
supported by previous versions.
7zip now supports new state (-uw switch) for cases
when 7zip can not detect whether file is newer or the same.
Supporting anti-items in 7z format for incremental
update (-u with action #3).
Some bugs were fixed.

7zip 2.30 Beta 7

2001-11-04

BCJ2: new converter for x86 code.
Supporting tar archives with very long file names
(GNU extension to 'tar' format).
Supporting multistream coders in 7z (-mb switch).
More compressing parameters for zip and gzip
in console version (-m switch).
Solid compressing option in Windows version.
Compressing parameters option in Windows version.
Auto renaming existing files feature for
extracting files.
Overwrite mode switch for extracting (-ao).
Some bugs were fixed.

7zip 2.30 Beta 6

2001-10-13

Supporting 7z format in MultiArc plugin for FAR Manager.
Some bugs were fixed.

7zip 2.30 Beta 5

2001-10-02

Creating SFX archives from explorer.
7zWin.sfx: Windows version of SFX module.
Auto adding .exe extension to SFX archive name.
7za.exe now supports 7z, bzip2, gzip, tar, zip.
Some bugs were fixed.

7zip 2.30 Beta 4

2001-09-15

Self extract capability for 7z format.
7z archive format is default for 7z.exe and 7za.exe.
7z in default mode now uses bt234 match finder
and solid compression.
7z in maximum mode (-mx) now uses 4MB dictionary.

7zip 2.30 Beta 3

2001-09-10

Bug was fixed: decompressing .7z solid archives
containing empty files.
new 7za.exe: standalone command line version
(only for 7z format).
Speed of compressing to Deflate format (zip, gzip)
was slightly increased.

7zip 2.30 Beta 2

2001-08-30

Supporting the new 7z format with high compression ratio.
-bd (Disable percentage indicator) switch in
console version.
Bug in console version was fixed:
previous versions incorrectly execute compression
commands with non-recursive wildcards in combination
with subfolders.
Some other bugs were fixed.

7zip 2.30 Beta 1

2001-05-07

Speed of reading of archive contents was increased.
Bug was fixed: incorrect showing file names with
national charsets in some zip archives.
Now it is possible to compress files larger than 4GB
to GZip archives.

7zip 2.24

2001-03-21

Bugs in GZip and Cab decoders were fixed.

7zip 2.23

2001-03-04

Opening archive items in Explorer.
Context menu for archive items in Explorer.
Automatic adding extension to archive name in console version.
Some bugs were fixed.

7zip 2.22

2001-01-21

Supporting Zip archives containing more than 65535 files.
Speed of Plugin for Explorer was increased.
Searching start position of archive now is limited by
first 1MB part of file.
Some bugs were fixed.
Packet now doesn't contain 7zip.exe, far7zip.reg and
far7zip2.reg files. There is new far7z.reg file.

7zip 2.21

2000-12-21

FAR Plugin was improved:
- Showing process box during opening archives.
- Viewing properties of file by Ctrl-A.
- Alt-F6 in archive now immediately extracts selected files
to current directory.
Some bugs were fixed:
- Entering to archive's subfolders in Explorer by clicking
items in main window didn't work under Windows ME/2000.
- Decompressing solid Rar archives sometimes gave error.
- Console version 7z.exe during list operation incorrectly
showed file names with national (non-english) charsets.
- FAR Plugin didn't execute some operations.
- Showing percents during extracting ZIP archives sometimes
was incorrect.

7zip 2.20

2000-11-20

Supporting BZip2 and Cab.
New program architecture with external
compression and cryptographic modules.
Decryption support (Rar and Zip).
New console client.
Some bugs were fixed.

7zip 2.11

2000-06-15

Bugs were fixed:
- FAR Plugin incorrectly processed
names of subdirectories that use national
(non-english) charsets.
- gzip plugin could not compress empty files.

7zip 2.10

2000-05-16

First level 7zip Plugin for FAR Manager.
GUI version with integration to Windows Shell.
Compression and decompressing GZip and TAR formats.
Decompression RAR.
Install & Uninstall support.
Some bugs were fixed.

7zip 2.01

1999-09-19

Small bug was fixed.
Compression ratio was improved for some files.

7zip 2.00

1999-07-18

Release.
Big bug was fixed: previous versions incorrectly worked
during compressing with files that were referred by
direct(without wildcards) paths, containing subdirs parts.
Compression and decompression speed were improved.
-mx switch (maXimize compression) was added.
Small bugs were fixed.

7zip 2.00 Beta 1

1999-01-02

Original beta version.