What is a .SIS File And How To Open It – Valve (Simple Steps)


Have you downloaded a file with .sis extension, but you are not sure what it is? Perhaps you know what the file is, but you simply don’t know how to open it. Fear not, in this article we will show you how to easily open the .sis file in few simple steps on various systems.

What is a .SIS file?

The .SIS file extension comes from Steam Game Backup Information File. It was developed by Valve. This file belongs to the text format and it is a backup file.

What to know

There is currently 1 software that can open the .sis file on 1 platform.

How to open a .SIS file?

Below we have written a comprehensive guide on how to open the .SIS file on various operating systems.

How to open a .SIS file on Windows (7, 8, 10)

To open the .sis file on Windows, please follow these 4 easy steps.

1. The first step is to download the Valve Steam software. You will be using this software in order to open the file. Other software that can be used in opening this file is: Valve Steam.

Step 2

Step 2: Locating your .SIS file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choose the software and click ok

4. In the fourth step, after clicking “Open with”, you should see the Valve Steam software that you have downloaded. Choose your software and click on “OK”. Congratulations! You have opened your file on Windows.

Still cannot open the .SIS file?

If you cannot open the .SIS file, it is entirely possible that you are trying to open the wrong file. There are many similar file extensions that look like the .SIS file.sis – Symbian, .sis – Digital Conference, .sis – arivis. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.


In this article you have learned how to open the .SIS file with the Valve Steam program on Windows.