

If there are similar files in different folders, the sorting "by type" can provide If dictionary size is smaller than total size of files. You can get big difference in compression ratio for different sorting methods, (or -mqs switch for command line version).

You must run 7-Zip File Manager in administrator mode. How can I set file associations to 7-Zip in Windows 7 and Windows Vista? User FAQ Can I use 7-Zip in a commercial organization?
