SIS File Type

- The quick facts

What are SIS files and how to open them

Are you having problems opening a SIS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a SIS file?

SIS files have multiple uses, and Symbian Installation Source is one of them.

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 10 different SIS openers which you will find listed below.

Last updated: March 26, 2022

More file formats using the SIS extension

Through our research of SIS files, we know that the following formats exist. However, we have not yet analyzed them in detail, and we would love to hear from you if you have information about either of them.

EPOC Installation package

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.