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CHANGELOG

What's New in version 20.02 Alpha:

  • 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, 7-Zip 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.

What's New in version 20.01 Alpha:

  • 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, 7-Zip 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.

What's New in version 20.00 Alpha:

  • 7-Zip 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.

What's New in version 19.01 Alpha:

  • 7-Zip now can unpack files encoded with Base64 encoding (b64 filename extension).
  • The source code of new version and another additional packages will be released later after some testing period.
  • 7-Zip 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:

  • 7-Zip 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&'37; speed optimization in 7-Zip benchmark's decompression.
  • Some bugs were fixed.

What's New in version 18.05:

  • The speed for LZMA/LZMA2 compressing was increased by 8 percent for fastest/fast compression levels and by 3 percent for normal/maximum compression levels.
  • 7-Zip 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 7-Zip could work incorrectly in 'Large memory pages' mode in Windows 10 because of some BUG with 'Large Pages' in Windows 10.
  • Now 7-Zip 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.

What's New in version 4.71:

  • The speed for LZMA/LZMA2 compressing was increased by 8 percent for fastest/fast compression levels and by 3 percent for normal/maximum compression levels.
  • 7-Zip 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 7-Zip could work incorrectly in 'Large memory pages' mode in Windows 10 because of some BUG with 'Large Pages' in Windows 10.
  • Now 7-Zip 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.

What's New in version 18.04 Beta:

  • The speed for LZMA/LZMA2 compressing was increased by 8 percent for fastest/fast compression levels and by 3 percent for normal/maximum compression levels.
  • 7-Zip 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 7-Zip could work incorrectly in 'Large memory pages' mode in Windows 10 because of some BUG with 'Large Pages' in Windows 10.
  • Now 7-Zip doesn't use 'Large Pages' on Windows 10 up to revision 1709 (16299).
  • Some bugs were fixed.

What's New in version 18.02 Beta:

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

What's New in version 9.20:

  • Some bugs were fixed.