unshieldv3 (extract v3 InstallShield files) unshieldv3 is a command line tool to extract the *.Z InstallShield v3 packages many old windows games were distributed as. The files unshieldv3 supports are identified by the file command as "InstallShield Z archive Data", and begin with a hex signature of 13 5d 65 8c 3a 01 02. See also: - unshield, for other types of InstallShield files. - isextract, for another v3 extractor. - cabextract, for cabinet (.cab) files.