Open Inaccessible Files for Free

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in the OneNote Format

I think that OneNote is not as popular as some other applications from the Microsoft Office suite. Therefore, if something goes wrong, there isn’t much of a chance of finding a suitable solution because there are few users and, respectively, reviews too. As for the possible problems, everything is the same as with other applications— they can appear from crashes of the OneNote application itself or errors in the hard drive and operating system. So, if you are facing the fact that OneNote notes do not open for some reason, here you have at least a couple of reasons to be optimistic. Firstly, automatic backup is enabled by default in this program. Secondly, some programs allow you to open files with the extension * freely.ONE and * .ONENOTE for viewing. Looking ahead, I’ll say that out of many different services, I liked Recovery Toolbox for OneNote, most of all.

How Automatic Backup Works

Initially, you should remember that the problem is much easier to prevent than to cope with the consequences and trying to minimize the damage later when something has already happened. Therefore, take a couple of minutes right now and open the Microsoft OneNote settings: File – Options – Save and backup, there you can see the current backup settings, which can be done without your participation and can help in the future. In this window, you can change the backup period and make a backup every day, for example. Well, in this case, restore everything is generally elementary. If Microsoft OneNote notes do not open for some reason when the program starts, go to the following menu: File – Details – Open Backups, where you will see a list of folders. The folders already contain backups that you can restore right now. Select the one you need and click on the Open button. Remember that sometimes a folder may overflow. I saw reviews in the network that a crowded folder with automatic backups could also damage OneNote files. Furthermore, consider occasionally clearing the cache. Copying files using Windows tools or you can delete them easily through the Task Scheduler.


Of course, you can turn off automatic backup and configure it in other ways, for example, using Windows tools. But what if there is no backup at all and recovery by this method is impossible?

Sync with Other Devices

The advantage of Microsoft OneNote is that notes are available on different platforms. The availability involves synchronizing data with other devices, which allows you to recreate notes from the cloud if the local copy of the data is damaged or missing. Therefore, recovering data is easy, even if you had to reinstall Windows. You need to do the following:

  1. Check here: File – Options – Save and backup, the location of the local copy of the data
  2. Open the folder where local copies are stored, the default path: C: Users AppData Local Microsoft OneNote
  3. Delete all local copies. OneNote may not open due to their damage
  4. Check your Internet connection
  5. Press SHIFT + F9 to start synchronization

If everything went well, all notes must be synchronized. In OneNote, you will see the same information as on the other device, for example, on an Android tablet. And if not? If, for example, there is no way to synchronize data, and a local copy of OneNote is all that you have, and the file does not open. Perhaps, there are no other possible devices to synchronize data. OneNote has always worked offline, and the computer was not connected to the Internet at all, and this is not so unbelievable as it might seem. In such cases, I advise you to try Recovery Toolbox for OneNote.

Third-Party OneNote Data Recovery

You can view the cache of corrupted Microsoft OneNote files using Recovery Toolbox for OneNote. This software is completely free unless you need to save something to a OneNote document, i.e., create a new OneNote document that will open in the usual way. Have you only forgotten what exactly the data stored in the OneNote is? Then you need to give it a quick once over and make sure that there is nothing urgent and calm down. This tool is what you need precisely. The demo version of Recovery Toolbox for OneNote is distributed without any restrictions, it works on any computer and opens the * .ONENOTE and * .ONE records created in any version of the application. Even though the Microsoft OneNote application itself, in principle, works for both Android and iOS, in this case, recovery is only possible on a Windows computer. The program needs to be used when synchronization with the cloud, for some reason, is impossible, and corrupted OneNote files on the local computer are all that you have without other options. There is not a problem if suddenly there is no Internet on the computer where you are going to use Recovery Toolbox for OneNote. You can copy the installation file to a USB flash drive from another computer and transfer it. This program does not require any connections.


You need to do the following:

  1. Download Recovery Toolbox for OneNote from
  2. Install the program on the computer and run it
  3. Select the damaged OneNote file to work
  4. Click on the Analyze button
  5. View recovery results
  6. Select a folder to save the recovered files
  7. Save the recovered data

You will only be able to save recovered data if Recovery Toolbox for OneNote is registered. You can view without registration, but not save. Decide for yourself whether you need it. You do not need to redownload anything. There are no new versions of the program. Just get a registered key to the program, enter it in Recovery Toolbox for OneNote following the instruction, and that’s all. You can save the information, and open recovered files can freely in OneNote.



The program works with any version of OneNote and on any computer that has Windows, no matter which version. Recovery Toolbox for OneNote is created for the most challenging cases when synchronization with the server for some reason is impossible, and access to notes is needed right now. You may also need a previous version of the notes in OneNote format. Plus, you can only take it from an old damaged file that does not open normally in OneNote. I think this is the best solution in the absence of backup. But, remember that even the most advanced recovery service can’t guarantee success. Too many things depend on the state of the source file. So, in any case, it makes sense to check first the effectiveness on the demo version of Recovery Toolbox for OneNote. And also, it is better to consider having a backup. How you will do it depends on your discretion. You can save the essential documents separately, or you can make an image of a hard disk and regularly update it. Remember, the problem is best to be prevented, and not then try to fix its consequences, which may be associated with direct losses. Take care of yourself and avoid such situations.

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