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001/7z.001 is part 1 of a compressed archive created by 7-Zip, a free file compression and decompression utility; contains one part of a multi-volume archive that splits a .7z file into parts (other parts use the '.7z.002,' '.7z.003,' etc. extensions); enables large 7z files to be broken into smaller parts for piecewise download or for storage on external media with fixed capacities.

You need all parts of a 7-Zip split archive in order for 7-Zip to rebuild the original '.7z' file. Once 7-Zip has reconstructed the 7z file, it can then decompress the 7z file to extract the files from the compressed archive.

7-Zip does use the following sequence:

  • .7z.001 for first volume
  • .7z.002, .7z.003, .7z.004, ..., etc. for any additional volumes

7z is compressed archive created with Igor Pavlov's 7-Zip file compression utility; uses open-source LZMA compression, which has a high compression ratio and can include strong AES-256 (256-bit) encryption; supports Unicode file names, archive header compression, and file sizes up to 16,000,000,000 GB.

While 7z compression uses the LZMA method by default, the 7z format also supports the PPMD, BCJ, BCJ2, BZip2, and Deflate compression methods.

Open/Extract 001/7z.001 File on Windows

Easy 7-Zip opens/extracts 001/7z.001 file easily on Windows. The Easy 7-Zip was developed based on 7-Zip. 7-Zip is a famous open source file archiver. The Easy 7-Zip is an easy-to-use version of 7-Zip. The open source freeware keeps all features of 7-Zip and adds a few useful features that makes the software more user-friendly.

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Easy 7-Zip works on Windows 10/8.1/8/7/Vista/2008/2003/XP/2000 (both 32-bit and 64-bit compatible).

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  1. Free Download Easy 7-Zip
  2. Install Easy 7-Zip by step-by-step instructions
  3. The installation will associate 001/7z.001 with Easy 7-Zip automatically
  4. Double-click on 001/7z.001 file to open 001/7z.001 file with Easy 7-Zip

  5. You will see files or folders within the 001/7z.001 file then, click button Extract to extract the 001/7z.001 file.
  6. Alternatively, Right-click on 001/7z.001 file on Windows Explorer

  7. And then, choose Extract files..., Extract Here, or Extract to 'folder' to extract the 001/7z.001 file.
  8. Done

Easy 7-Zip Download Links:

You can try other alternative freeware that opens/extracts 001/7z.001 file on Windows. For example:

  • PeaZip
  • TUGZip
  • B1 Free Archiver
  • IZArc
  • Zipeg
  • Universal Extractor
  • Bandizip
  • FreeArc
  • Bitser

Open/Extract 001/7z.001 File on Mac

B1 Free Archiver opens/extracts 001/7z.001 file on Mac. B1 Free Archiver is a free software for creating archive folder and extracting archive file. B1 Archiver works on all platforms - Windows, Linux, Mac and Android. The freeware supports most popular formats including 001/7z.001.

B1 Free Archiver is compatible with:

  • Mac OS X 10.9 Mavericks
  • Mac OS X 10.8 Mountain Lion
  • Mac OS X 10.7 Lion
  • Mac OS X 10.6 Snow Leopard

Alternative freeware that opens/extracts 001/7z.001 file on Mac.

  • Keka
  • GUI Tar
  • The Unarchiver
  • EZ 7z
  • 7zX

Open/Extract 001/7z.001 File on Linux

You need to install p7zip. p7zip is the Unix port of 7-Zip, a file archiver that archives with very high compression ratios. p7zip-full provides utilities to pack and unpack 7z archives within a shell or using a GUI (such as Ark, File Roller or Nautilus).

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Install p7zip-full on CentOS and Fedora

# yum install p7zip-full
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Install p7zip-full on Debian and Ubuntu

$ sudo apt-get install p7zip-full

You can extract/decompress 7z split archives directly, no need to concatenate the parts prior to extraction. The only requirement is that 7z split archives must have incremental extensions of the type .XXX (where X=[0..9]) starting from .001. This is probably because when you create a split archive using 7-Zip, it will name each part of the archive this way. Then, all you have to do is run the command on the first archive:

Extract 001/7z.001 file on Linux

$ 7z x sample.7z.001
Copyright © 2013-2017 James Hoo All rights reserved.

7-Zip is a file archiver with a high compression ratio.

Download 7-Zip 19.00 (2019-02-21) for Windows:

Download.exe64-bit x641.4 MB
Download.exe32-bit x861.2 MB

Download 7-Zip 21.03 beta (2021-07-20) for Windows:

Download.exe64-bit x641.4 MB
Download.exe32-bit x861.2 MB
Download.exe64-bit ARM641.5 MB


7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code. Read 7-Zip License information.

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

  • High compression ratio in 7z format with LZMA and LZMA2 compression
  • Supported formats:
    • Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
  • For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 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 87 languages

7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2019 / 2016 / 2012 / 2008 / 2003 / 2000.

p7zip - the port of the command line version of 7-Zip to Linux/Posix.

On 7-Zip's SourceForge Page you can find a forum, bug reports, and feature request systems.

Compression ratio

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We compared 7-Zip with WinRAR 5.20.

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FILE SETS: Mozilla Firefox 34.0.5 for Windows and Google Earth for Windows.

ArchiverMozilla FirefoxGoogle Earth
65 files
85 280 391 bytes
483 files
110 700 519 bytes
Compressed sizeRatioCompressed sizeRatio
7-Zip 9.35
39 357 375100%15 964 369100%
WinRAR 5.20
-m5 -s -ma5 -md128m
41 789 543106%17 035 432107%

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Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs.