isextract (extract v3 InstallShield files)

isextract is a command line tool to extract the *.z InstallShield v3
packages many old windows games were distributed as.

The files isextract 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.
- unshieldv3, for another v3 extractor.
- cabextract, for cabinet (.cab) files.
