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@github-actions github-actions released this 10 Nov 14:02
v26.05.1
97286ca

The first public release of 7-ZSTar, a 7-Zip fork that's friendlier to modern Windows 11 users: first-level right-click menu, zstd compression, one-pass tar.zst. It is based on 7-Zip 26.05.

Highlights

  • On the first level of the Windows 11 right-click menu. Install the all-users .msi and 7-ZSTar sits there, not under "Show more options".
  • One pass, no .tar on disk. Compressing to tar.zst and extracting it are each a single step. Official 7-Zip can't create a .tar.zst, and extracts one in two steps, through a .tar.
  • Much faster than 7z on project folders. On three real project folders, tar.zst compressed 10 to 18 times faster than 7z, at 15 to 27% larger files; 7z is still the pick when the smallest file matters most. Figures, machine and method: Speed.
  • More formats. One-step compression to tar.zst, tar.br, tar.lz4, tar.lz5, tar.liz, tar.gz, tar.bz2 and tar.xz, and one-step extraction of those plus tar.lzma and tar.Z. zstd, brotli, lz4, lz5 and lizard are also available as standalone formats and as methods inside .7z, with fast-lzma2 as an alternative LZMA2 encoder. Every format 7-Zip already supports is still here.
  • Security fixes from 7-Zip 26.05 and brotli 1.2.1. This release includes upstream's fixes for CVE-2026-58052 and CVE-2026-104086, and brotli's fix for CVE-2026-111497 (an out-of-bounds write in the decoder that a crafted .br stream could trigger).
  • Installs alongside official 7-Zip without disturbing it, with upstream's translations in about 90 languages.
  • README in ten languages. English, 繁體中文, 简体中文, Deutsch, Français, Español, Português (Brasil), 日本語, Tiếng Việt and Esperanto: use the language bar at the top of the README.

Command line:

7z a -ttar.zst backup.tar.zst docs
7z x backup.tar.zst -oout

In PowerShell, put the format switch in quotes, as in 7z a "-ttar.zst" backup.tar.zst docs. Without them PowerShell splits -ttar.zst in two and 7z creates a file named .zst. Command Prompt (cmd) needs no quotes.

Before you install

  • Windows 7 or Windows Server 2008 R2 and later on x64 and x86; Windows 10 and later on arm64. The arm64 builds haven't been run on real hardware yet.
  • The installers aren't code-signed, so Windows SmartScreen may warn, and on a Windows 11 PC with Smart App Control turned on the .msi installers are blocked outright, with no option to continue. See the install guide below.
  • Known limitations are listed in the README.
  • Install options, file associations and uninstalling, including how to check a download against SHA256SUMS: docs/INSTALL.md.
  • To report a security problem, see SECURITY.md.

Donate

7-ZSTar is free to use, whether you chip in or not. If it has saved you some time, you can send any token on Ethereum or Polygon to the address in the README. The About dialog has a Donate button too.

Everything that changed: CHANGELOG.md.

Verifying

Compare your download against SHA256SUMS. These artifacts are
not code-signed, so Windows SmartScreen will warn on first run.
The only signature is on the Windows 11 context-menu package
inside the per-machine .msi: a self-signed certificate generated
while building that one package (each architecture has its own),
whose public half the installer adds to the machine's Trusted
People store and the uninstaller removes again.
It is not a certificate-authority signature and says nothing about
who built the package.

Packages

.msi installs per-machine and registers the Explorer context
menu; -user.msi installs for the current account only, needs no
administrator, and has the context menu without the Windows 11
first-level entry; .zip is portable, needs no administrator, and
registers nothing. Install one of the two .msi per machine, not
both, and pick the architecture of Windows itself (x86 on 32-bit
Windows, x64 on 64-bit, arm64 on Windows on Arm): the x86 shell
extension is 32-bit and 64-bit Explorer cannot load it. All
of them install alongside official 7-Zip without disturbing it.

*-source.tar.gz is the corresponding source for these binaries,
included to satisfy LGPL v3 section 4(d).

Full Changelog: https://github.com/7zStar/7-ZSTar/commits/v26.05.1

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