What is a .ONETOC2 File And How To Open It – Microsoft (Guide)

Table of Contents


Have you came across a file with the .onetoc2 extension and you don’t know what it is? You most likely know what the file is, but you might be unsure on how to open it. That’s why we have made this article! You will learn how to open the .onetoc2 file extension on various systems, what it is and how to work with it.

What is a .ONETOC2 file?

The .ONETOC2 file extension is Microsoft OneNote Table of Contents File. The creator of this file extension is Microsoft. This file belongs to the binary format and it is a settings related file.

What to know

There is currently 1 software that can open the .onetoc2 file on 1 platform.

How to open a .ONETOC2 file?

Below we will show you a step-by-step guide on how to open the .ONETOC2 file on various operating systems.

How to open a .ONETOC2 file on Windows (7, 8, 10)

Below you can see a visual guide on how to open the .onetoc2 file on Windows in 4 easy steps.

1. In the first step you need to download the Microsoft OneNote 365 software. You will be using this software in order to open the file. You can also use Microsoft OneNote 365 software.

Step 2

Step 2: Locating your .ONETOC2 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 OneNote 365 software you have downloaded. Choose your software and click on “OK”. That’s all, now you have opened your file on Windows.

Still cannot open the .ONETOC2 file?

If you cannot open the .ONETOC2 file, it is entirely possible that you are trying to open the wrong file. There are many similar file extensions that look like the .ONETOC2 file.ont – theWord Bible Software, .ontx – theWord Bible Software, .oo3 – The Omni Group, .oo3template – The Omni Group, .ook – Arachne. You might be trying to open one of them. Please recheck the file extension again.


In this article you have learned how to open the .ONETOC2 file with the Microsoft OneNote 365 program on Windows.