Symbian has recently added a new important tech paper documenting the Symbian OS v9.X SIS files. It was written by Symbian’s Security team and it describes the newly restructured and redesigned SIS file format introduced to complement the new security architecture of Symbian OS v9.1. If you’re a developer for Symbian platform, you’re probably aware of SIS files. They are used as a primary means of packaging files for deployment to a device, and are interpreted accordingly by the software installer. As well as simply containing files, the SIS file can contain conditional statements which influence the installation e.g. device specific installations, language-specific installations, and user-selectable optional components.
The document is in PDF format and you can get it from here.