One curious aspect of the numbering system is that if you delete the Archive.zip files at a later date, and then compress multiple files in the same folder, the new Archive.zip file will have the next number in the sequence appended to it; it won't start over. For example, if you compress three groups of multiple items in a folder, you'll end up with files called Archive.zip, Archive 2.zip, and Archive 3.zip. If you delete the zip files from the folder, and then zip another group of items, the new file will be called Archive 4.zip, even though Archive.zip, Archive 2.zip, and Archive 3.zip no longer exist (or at least, not in that folder).
7-Zip Extra: standalone console version, 7z DLL, Plugin for Far Manager. (alternative MSI installer) 7-Zip for 32-bit Windows. 7-Zip is a file archiver with a high compression ratio. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. 7-Zip works for Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98.