FileStorm and FileStorm Pro require Mac OS X v10.4 or greater. NOTE: One exception is that these applications require Mac OS X v10.4.3 or greater for encrypting a disk image (with AES-128 encryption) so that it requires a password to mount.  

Disk images and the FileStorm Installer (included with FileStorm Pro) built with FileStorm are fully compatible with Mac OS X v10.2 and greater.