If you want to block more extensions, you can enable the “Block additional file extensions for OLE embedding” policy and specify which other extensions you want to block. For a list of those extensions, see Blocked attachments in Outlook. This change won't affect OneNote in volume licensed versions of Office, such as Office LTSC Professional Plus 2021 or Office Standard 2019.īy default, OneNote blocks the same extensions that Outlook, Word, Excel, and PowerPoint do.They're on the same schedule as Current Channel. This change will also affect OneNote in retail versions of Office 2021, Office 2019, and Office 2016.Information in italics is subject to change. The following table shows the version, for each update channel, in which the blocking change is implemented. The change doesn’t affect OneNote on a Mac, OneNote on Android or iOS devices, OneNote on the web, or OneNote for Windows 10. This change only affects OneNote for Microsoft 365 on devices running Windows. Versions of OneNote affected by this change If you have other security measures in place, such as antivirus software or Smart App Control, it's possible that the file will be blocked by those tools when you try to save or open it from your local device. If you trust the person who sent you the embedded file, and you need to open the embedded file, then save the file to your local device, and open the file from there. How to open the embedded file (if necessary) ![]() For more information, see Versions of OneNote affected by this change.įor more information about which extensions are considered dangerous and are blocked, see Extensions that are considered dangerous. This change is planned to begin rolling out with Version 2304 in April 2023. With this important change, OneNote blocks users from directly opening an embedded file with a dangerous extension and instead shows them the following dialog. But users could still open the embedded file with the dangerous extension by choosing OK in the dialog. ![]() Previously, OneNote showed users a dialog warning them that opening attachments could harm their computer and data. ![]() OneNote is making an important change to how it treats embedded files that have dangerous extensions.
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