File Extension ONETOC

Written by:   |   Refreshed: November 26, 2018

Microsoft Silver

ONETOC File Summary

Only one known software program, Microsoft OneNote developed by Microsoft Corporation, is related to the ONETOC file extension. In addition, they are categorized under a single primary file type, described as the Microsoft OneNote Table Of Contents format. ONETOC files are traditionally categorized as Settings Files.

Windows, Mac, and iOS operating systems can be used to view ONETOC files. Both desktop and mobile devices enable you to view and (sometimes) edit these files, depending on the software used. The Popularity Rating for ONETOC files is "Low", which means these files are not ordinarily found on an everyday user's device.

If you would like to learn more about ONETOC files and the software that opens them, please see the additional detailed information below. Also, you can learn how to do some basic ONETOC file troubleshooting if you are having trouble opening these files.

Low
Universality
8837
Ranking

/ 11690

Active

Relevance

26

November

2018

Page Last Updated

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Sorts of ONETOC Files


Chief ONETOC Description

.ONETOC
File ID:.onetoc
Type:Microsoft OneNote Table Of Contents

Primarily, the ONETOC file extension is related to Microsoft OneNote, an app used to create notes and journal as well as shareable with other internet users. The ONETOC files contain Table of Contents files.

Organization: Microsoft Corporation
Division:Settings Files
Subkey: HKEY_CLASSES_ROOT\.onetoc

Software Programs That Open The Microsoft OneNote Table Of Contents:


Microsoft OneNote by Microsoft Corporation

Windows
Windows Phone
Mac
iOS
Android

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ONETOC Demand


OS Ranking

Windows (82.33%)
Android (11.56%)
iOS (3.43%)
Macintosh (1.71%)
Linux (0.60%)


ONETOC Troubleshooting


Troubles Opening ONETOC Files

Microsoft OneNote Not Present

If you attempt to load your ONETOC file, you experience a message such as "Can't Open ONETOC Files". Usually, this is because you do not have Microsoft OneNote for %%os%% installed. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.


Tip: If you know of another program that can open your ONETOC file, you can try opening it by selecting the application from the programs listed.


Outdated Microsoft OneNote

Occasionally, you might have an outdated version of Microsoft OneNote installed that's incompatible with your Microsoft OneNote Table Of Contents type. If you do not have the proper version Microsoft OneNote (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. Most of the time your Microsoft OneNote Table Of Contents file was created by a newer Microsoft OneNote than what you have installed.


Tip: Find clues on the correct software version by right-clicking your ONETOC file and clicking "Properties".


Regardless, most of the ONETOC file opening problems relate to not having the right version of Microsoft OneNote installed.


More Causes of Problems Opening ONETOCs

Assuming you have the right Microsoft OneNote version installed, other problems can prevent you from opening ONETOC files. There can be external issues inside of %%os%% that are causing these errors when opening ONETOCs. These other problems include (listed in order from most to least common):

  • ONETOC file type Registry entries are wrong
  • Deletion of the ONETOC file description from the Registry by mistake
  • Invalid installation of a ONETOC-associated program (eg. Microsoft OneNote)
  • Something has caused file corruption of your ONETOC
  • Past or present virus infection has affected your ONETOC
  • ONETOC-related hardware has device drivers that obsolete
  • Windows has inadequate resources to open your Microsoft OneNote Table Of Contents file

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