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1999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。Changes in 7-Zip 9.29 Alpha, 2012-09-07:
- LZMA2 now is default compression method for .7z format.
- 7-Zip now can update WIM archives.
- 7-Zip File Manager now can move files to archives.
- 7-Zip File Manager now can calculate CRC-32, SHA-1 and SHA-256 checksums for files.
- The default encoding for TAR format now is UTF-8. You can use -mcp=1 switch for OEM encoding.
- Command line version:
- – new “rn” command to rename files in archive.
- – new -sdel switch to delete files after including to archive.
- – new -sns switch to store NTFS alternate streams (for WIM format only).
- – new -sni switch to store NT security information for files (for WIM format only).
- – new -stl switch to set archive timestamp from the most recently modified file.
- Speed optimizations for opening big archives and big disk folders.
- DMG support was improved
- Some bugs were fixed.
- New localization: Aragonese.

下载:7-Zip 9.29 Alpha (32-bit)
下载:7-Zip 9.29 Alpha (64-bit)