7-Zip 9.31 Alpha

7-Zip is a open source file archiver with a high compression ratio. The program supports 7z, XZ, BZIP2, GZIP, TAR, ZIP, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.

The main features of 7-Zip are:

  • High compression ratio in new 7z format with LZMA compression
  • Compression ratio for ZIP and GZIP formats: 2-10 % better than the ratio provided by PKZip and WinZip
  • Strong AES-256 encryption in 7z and ZIP formats
  • Self-extracting capability for 7z format
  • Integration with Windows Shell
  • Powerful File Manager
  • Powerful command line version
  • Plugin for FAR Manager
  • Localizations for 74 languages

What's new after 7-Zip 9.30 Alpha:

  • 7-Zip now can create multivolume SFX archives in 7z format.
  • ZIP, NSIS, HFS, AR support was improved.
  • 7-Zip 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.
  • 7-Zip File Manager now also takes into account the numbers in filenames for sorting order.
  • 7-Zip 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.

The BUGs were fixed:

  • 7-Zip could work incorrectly in decompression of more than one
  • multi-volume archive in one command.
  • 7-Zip 9.24 alpha - 9.30 alpha versions could not extract ZIP archives
  • encrypted with PKWARE-AES method.

New localization: Irish.

Download: 7-Zip 9.31 Alpha | 7-Zip 64-bit | 1.3 MB (Open Source)
Download: 7-Zip Theme Manager 2.1
View: 7-Zip Website | Announcement

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31 Comments

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I was wondering when 7zip would get an update.. been over a damn year.

No RAR5 support though; sticking to WinRAR still as the new format is great.

DAOWAce said,
I was wondering when 7zip would get an update.. been over a damn year.

No RAR5 support though; sticking to WinRAR still as the new format is great.


rar is a proprietary format, so that may be why it is taking awhile to add it. personally, i don't like nor use rar.

The fact that they don't have to update their software for over a year MAY (emphasis on the may) speak to the fact that the software is very stable/secure and does its job well, therefore not a lot of updates are required even on what they call an alpha. Based on previous comments, I this seems to be the case, here.

There we go with that ridiculous comment again!

You KNOW it's a great program when the only thing some one can say about it is that! Do you actually set there and look at that? Sheesh!

Sure hope they do NOTHING with the UI as that will only lead to bloat just for eye candy, and screw up it's usefulness, like so many other programs have done!

The ONLY program out there that I will use while it's called a "beta" In fact, it's always called a beta, isn't it? LOL

9.2 doesn't have 32bit shell extensions if you install the 64bit version - and if you end up using something like Xyplorer it it won't show up on context menus because the app is 32bit.

Risky or not it may all depend on the quality of software. 7-Zip is one of the applications that is of very high quality as I've been using the previous alpha version (9.30) on a daily basis ever since it came out a year ago and never had any problems.

NyaR said,
9.2 doesn't have 32bit shell extensions if you install the 64bit version - and if you end up using something like Xyplorer it it won't show up on context menus because the app is 32bit.

i've installed the x86 version on x86 win and the shell extensions work fine. same for the x64 version on x64 win. are you saying you installed x86 version on x64 win?if so then that is the problem.

The 64x version of 7zip stable does not set 32x shell extensions, so when I am using the program Xyplorer there are no shell menus because the program is 32 bit. Unless I install one of the betas/alphas - they set the 32x shell extension.

I don't need troubleshooting. I was pointing something out. Literally just rewrote my first post for you...

soldier1st said,
if so then that is the problem.

That's not the problem. The 64-bit version of 7-zip should install 32-bit *and* 64-bit shell extensions.

Why all the software update notices? Doesn't windows let you update all your apps automatically, or do you have to manually download an update for each app on your system?

[quote=Geezy said,]Why all the software update notices? Doesn't windows let you update all your apps automatically, or do you have to manually download an update for each app on your system?[/quote
many can be updated via the apps update checker but some apps lack that. 7zip lacks an update checker.

So it's on a per-app basis? The app store or control panel add/remove app can't just say, check for updates on all apps?

Geezy said,
So it's on a per-app basis? The app store or control panel add/remove app can't just say, check for updates on all apps?

I take it you have never used Windows? Nope, there is no built in system to achieve that.
There are 3rd party apps that will do it for you though.

I have, just not for everyday use. I don't tend to have a lot of software installed and start it up maybe once every few months and only use it offline.

I used to use it as my main OS (Win2k and previous) and am still interested in how it has improved, I am always considering what software best suits my needs.

It has just been a while since I have had to support an installation and have not used anything newer than Windows 7. I was under the impression that with Windows Update they now allowed third party software updates but I guess not.

Well, if you are talking Windows Store apps in Windows 8/8.1, then Windows does check for and install new third-party updates for you. But no not desktop apps through Windows Update.

statm1 said,
Well, if you are talking Windows Store apps in Windows 8/8.1, then Windows does check for and install new third-party updates for you. But no not desktop apps through Windows Update.
Probably should have mentioned that. lol

I pretty much consider these Alpha releases to be full releases because of how stable they are. So if you count the Alphas then its not AS slow.