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/7z920.05.exe7-Zip for 64-bit Windows x64:
http://dl.7-zip.org/7z920.05-x64.msiWhat's new:
- 7-Zip now can unpack UEFI BIOS files.
- 64-bit version of 7-Zip now includes additional 32-bit shell extension DLL. So other 32-bit programs can call 64-bit 7-Zip via context menu.
- Now it's possible to associate 7-Zip with file types without Administrator rights.
- New -mf=FilterID switch to specify compression filter. Examples: 7z a -mf=bcj2 a.7z a.tar 7z a -mf=delta:4 a.7z a.wav 7z a -mf=bcj a.tar.xz a.tar
- There are some changes in LZMA settings for BCJ2 filter. So compression ratio now is slightly improved for executable files in -mx9 mode for .7z format.
- Some bugs were fixed. - New localizations: Corsican, Kyrgyz.
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