.sis

Installer archive for devices that use the Symbian OS; examples include Palm PDAs and Nokia, Ericsson, and Motorola phones; created using Symbian's "makesis" command line tool, which is part of the CreateSIS program.

To install a SIS file on a compatible phone, you will need to transfer the file to the phone using the phone's PC communication software; then open the SIS file on the phone to run the installer.