7-Zip是一个开放源码的数据压缩程序，主要用在Microsoft Windows操作系统，Unix-like的操作系统如Linux与FreeBSD下面有7-zip的移植版本p7zip可以使用。它提供命令行接口的程序或图形用户界面的程序，而且可以与资源管理器结合。7-Zip是自由软件，由Igor Pavlov于2000年开始发展，并把主体在GNU LGPL下发布，加密部份使用AES的代码，使用BSD license发布，解压RAR部分使用RAR特定的许可协议.
7-Zip for 32-bit Windows:
http://dl.7-zip.org/7z920.09.exe
or
http://dl.7-zip.org/7z920.09.msi
7-Zip for 64-bit Windows x64:
http://dl.7-zip.org/7z920.09-x64.msi
更新：
- The bug was fixed: 7-Zip File Manager could work incorrectly with archives
in "Flat View" mode.
- 7-Zip File Manager now can update file in archive even if the file name is
not supported by Windows.
http://dl.7-zip.org/7z920.09.exe
or
http://dl.7-zip.org/7z920.09.msi
7-Zip for 64-bit Windows x64:
http://dl.7-zip.org/7z920.09-x64.msi
更新：
- The bug was fixed: 7-Zip File Manager could work incorrectly with archives
in "Flat View" mode.
- 7-Zip File Manager now can update file in archive even if the file name is
not supported by Windows.