• OneNote allows you to embed different types of files, such as documents, spreadsheets, images, audio, and video recordings, and more.

• OneNote is making an important change to how it treats embedded files that have dangerous extensions.

• Previously, OneNote showed users a dialog warning them that opening attachments could harm their computer and data. However, users could still open the embedded file with the dangerous extension by choosing OK in the dialog.

• Through this important change, OneNote prevents users from opening embedded files with dangerous extensions directly.

• According to reports, Microsoft is planning to automatically block embedded files with "dangerous extensions" in OneNote following reports that the note-taking service is increasingly being exploited to deliver malware.