Why didn't you people make an interpreted version so anyone could at least decode 7zip files without using Windows?
Even if you provided a command line program that could compile on Linux/Mac. It's only a file processor, how hard could it be?
you should try : http://p7zip.sourceforge.net/
p7zip is a port of 7za.exe for POSIX systems like Unix and MacOS X.
Remark : if you search "7-zip unix" on google,
p7zip is the 4th link ...