.SIS File Extension

Installer archive for Symbian OS, an operating system used for mobile devices, such as Palm PDAs and Nokia, Ericsson, and Motorola phones; created using Symbian's "makesis" command line tool, which is bundled with the CreateSIS program; often used for S60 phone theme installations.

NOTE: To install a SIS file on a compatible phone, use the phone's communication software to transfer the file to the phone. Then open the SIS file on the phone to run the installer.

Information file used by Steam, a gaming service that allows users to download and manage Valve games; contains plain text markups, which describe properties of a game backup; used in the process of restoring game backups.

SIS files are backed up with a .SIM file and one or more .SID data files.

File created by Sisma, a password manager for Windows; contains account information and passwords, which are encrypted using 256-bit AES encryption; used for storing confidential data that can only be retrieved with a single master password.

Sisma can store expiration dates for passwords in SIS files so that the passwords are invalidated after a period of time. The software can also assist users by creating random auto-generated passwords that are pronounceable.

NOTE: Sisma is free for personal use, but requires a purchased license for non-personal use.