What is a .DIAGSESSION File And How To Open It – Microsoft (Visual Guide)


Have you came across a file with the .diagsession extension and you don’t know what it is? It is possible that you know what the file does, but you are unsure on how to open it. Thanks to this easy guide you will be able to find out what .diagsession file extension is, how to open it and how to work with it.

What is a .DIAGSESSION file?

The .DIAGSESSION file extension comes from Diagnostics Session File. The developer of this file extension is Microsoft. The file is a development related file.

What to know

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

How to open a .DIAGSESSION file?

Below you can find an easy to understand, step-by-step guide to open the .DIAGSESSION file on your operating system/device.

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

The .diagsession file can be opened in 4 steps on Windows.

1. In the first step you need to download the Microsoft Internet Explorer software. You will be using this software in order to open the file. Other software that can be used in opening this file is: Microsoft Internet Explorer.

Step 2

Step 2: Locating your .DIAGSESSION file

2. The second step is locating the downloaded file. If you don’t remember where you have downloaded your file to, you should check your /download/ folder as it usually gets automatically saved there.

Step 3

Step 3: Choose “Open with”

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Choose the software and click ok

4. After choosing the “Open with” option, you will have an option to choose the Microsoft Internet Explorer software you have downloaded. Choose your software and click on “OK”. Congratulations! You have opened your file on Windows.

Still cannot open the .DIAGSESSION file?

If you are still unable to open the .DIAGSESSION file, it might be because you are trying to open the wrong one. There are many similar file extensions that look like the .DIAGSESSION file.dib – Microsoft, .dic – Dictionary File, .dic – NEMA, .dicom – NEMA, .dicproof – Microsoft. 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 .DIAGSESSION file with the Microsoft Internet Explorer program on Windows.