Fs2 open on Linux/Installing unshield
From FreeSpace Wiki
Note: Redhat, Slackware and all the other distributions should have their instructions on installing unshield added here, if your distribution is not listed below and you are familiar with how to install CVS on it, please add it to this section.
unshield is a tool used to extract InstallShield Cabinet Files, this is the type of compression format used on files on the FreeSpace 2 CDs.
Debian/Ubuntu users want to:
$ apt-get install unshield
Gentoo users want to:
$ emerge -a unshield
Archlinux users want to:
$ pacman -Sy unshield
Fedora Core 6 (Zod) (And most likely Redhat) users want to:
# yum install unshield
Mandriva users want to:
# urpmi unshield
Novell SuSE users install unshield via YaST.