SIS File

What are SIS files and how to open them

Are you having problems opening a SIS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your SIS files.

What is a SIS file?

SIS files have multiple uses, and Symbian Installation Source is one of them. Read more about the other uses further down the page.

Symbian Installation Source

SIS is an acronym for Symbian Installation Source. Symbian OS developed the SIS file format for use on mobile devices such as PDA's and Cellphones.

Contrary to popular belief, files with the .sis extension are installation files and not application files. The real application file is the .APP file that the SIS file adds to the device that the application is being installed on.

The SIS files are created with the Symbian's "makesis" command-line tool included with the CreateSIS development program. Program developers will often use the CreateSIS program when creating applications for the Symbian operating system.

How to open SIS files

Important: Different programs may use files with the SIS file extension for different purposes, so unless you are sure which format your SIS file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different SIS openers which you will find listed below.

Last updated: September 22, 2023

All known file formats using extension .SIS

While Symbian Installation Source is a popular type of SIS-file, we know of 2 different uses of the .SIS file extension. Different software may use files with the same extension for different types of data.

EPOC Installation Package

We know that one SIS format is EPOC Installation Package. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Various apps that use files with this extension

These apps are known to open certain types of SIS files. Remember, different programs may use SIS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about SIS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.