Fix OneNote Error: Embedded File Is Open in Another Application
Question details
The user is unable to reopen an embedded attachment (such as a Mathcad .xmcd file) in OneNote after previously closing it.
- Product
- Microsoft OneNote
- Device & OS
- not provided
- Scenario
- Attempting to reopen an embedded file in OneNote shortly after closing it, while the external application may still be running in the background.
- Observed behavior
- OneNote triggers an error stating the embedded file is open in another application, preventing the user from accessing the attachment.
Ensure you have saved any recent edits made to your embedded files and verify whether this error occurs with a single specific attachment or across multiple OneNote notebooks.
Fully Close the External Application
Force the external application to completely release the file lock by exiting the program entirely before attempting to reopen the file in OneNote.
When you edit an embedded file, OneNote transfers it to the default external application. Sometimes, simply closing the document window does not fully stop the background processes, preventing OneNote from regaining access.
Ensure all edits made within the external application (e.g., Mathcad) are saved.
Click the 'X' or use the File menu to close the currently open embedded document.
Close the entire external application, not just the file tab. Check your system tray or Task Manager to ensure no background processes related to the app are still running.
Return to your OneNote notebook and double-click the embedded attachment to open it again.
Repair the Microsoft Office Installation
If the error persists across multiple notebooks and different file types, repairing Microsoft Office can fix underlying software integration bugs.
Try WPS Office for Seamless Document Management
If you are frustrated by file-locking errors and integration glitches in Microsoft Office, consider switching to WPS Office. It provides a lightweight, highly compatible alternative with an intuitive tabbed interface, reducing application conflicts and simplifying how you handle your files.
- 1. Download the installer: Visit the official WPS website and download the free WPS Office installation file.
- 2. Install WPS Office: Run the downloaded executable and follow the quick setup wizard.
- 3. Open your files: Launch WPS Office and directly open your existing .docx, .xlsx, or .pptx files seamlessly.
Frequently Asked Questions
Why does OneNote say my embedded file is open when I just closed it?
Some applications take a few extra moments to fully release the operating system's file lock after closing the document. In other cases, the source application remains running in the background. Waiting a few seconds or completely exiting the source application usually resolves this.
Does this error only happen with Mathcad files?
No, this error can occur with any embedded attachment in OneNote (such as PDFs, Word documents, or Excel spreadsheets) if the external program handling that file format does not properly communicate to OneNote that the file has been closed.
Will running an Office repair delete my OneNote notebooks?
No, repairing Microsoft Office using the built-in repair tool only fixes corrupted application files and registry keys. Your notebooks are safely stored either locally on your hard drive or synced to OneDrive and will not be affected.
