TurboZIP is an Archive, E-Mail Manager and Auto Backup tool. It opens major archive and E-mail formats. It offers the unique capabilities to internally view, print, copy, launch, and virus
scan files within ZIP and E-mails without unzipping; unique ZIP Set and Multi-threading operation for simultaneous zipping, unzipping, auto backups..

TurboZip 5.1 appears to have been released sometime around January, 2003. Unfortunately, the FileStream web site doesn’t provide any sort of release history for this product, so it’s impossible to determine exactly when the release shipped and what features were added in 5.1.

http://www.filestream.com/turbozip/