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

Download 7-Zip 4.42 (2006-05-14) for Windows:
Download.exe 32-bit 818 KB Download.msi x64 1238 KB

Download 7-Zip 4.52 beta (2007-08-03) for Windows:
Download.exe 32-bit 835 KB Download.msi x64 1222 KB

The main features of 7-Zip

High compression ratio in new 7z format with LZMA compression
Supported formats:

Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS


For ZIP and GZIP formats, 7-Zip provides a compression ratio that
is 2-10 % better than the ratio provided by PKZip and WinZip
Self-extracting capability for 7z format
Integration with Windows Shell
Powerful File Manager
Powerful command line version
Plugin for FAR Manager
Localizations for 63 languages




7-Zip works in Windows 98/ME/NT/2000/XP. There is a port of the command line version
to Linux/Unix.


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