How to Rename a OneNote Notebook with a Period in Its Name
Question details
The user is unable to open or rename a OneNote notebook on another computer because its name contains a period, causing synchronization and access errors.
- Product
- Microsoft OneNote
- Device & OS
- not provided
- Scenario
- Attempting to access, sync, or rename a OneNote notebook across different devices via OneDrive when the notebook name includes a period.
- Observed behavior
- OneDrive misinterprets the portion of the notebook name after the period (e.g., ".3" in "Physics 2.3") as a file extension, rendering the notebook inaccessible or impossible to rename correctly on another device.
Ensure you have a stable internet connection and force a manual sync of your notebook on the original device to prevent any data loss before attempting to rename or move files.
Export, Rename, and Re-import via OneNote on the Web
The most reliable method to fix the file extension error is to download the notebook as a ZIP file, correct the name locally, and upload it as a new notebook.
Renaming the notebook directly within the OneNote desktop application only creates a local alias and does not change the underlying file name on OneDrive. To permanently fix the issue, you must export the actual source file.
Open your web browser, navigate to OneNote.com, and sign in with your Microsoft account.
Locate the problematic notebook in your list, right-click on it, and select 'Export'. This will download the entire notebook as a ZIP file to your computer.
Locate the downloaded ZIP file, right-click it, and select 'Extract All'. Open the extracted folder and rename the notebook folder to remove the period (for example, change 'Physics 2.3' to 'Physics 2-3').
Go to the OneNote Notebook Importer tool online, select the renamed folder, and upload it back to your account as a new, properly named notebook.
Download and Rename the Containing OneDrive Folder
If you cannot export the notebook directly from OneNote, downloading its parent folder from OneDrive allows you to modify the file name locally.
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Frequently Asked Questions
Why does a period break my OneNote notebook sync?
OneDrive and Windows file systems use periods to identify file extensions (like .docx or .pdf). When a notebook folder has a period in its name, OneDrive assumes everything after the period is a file extension, confusing the sync engine.
Can I just rename the notebook within the OneNote Windows app?
No. Renaming a notebook in the OneNote desktop application only creates a 'nickname' or local alias for display purposes. The actual file stored on OneDrive retains its original name, meaning the sync issue will persist across other devices.
How do I safely backup my OneNote notebook before trying these fixes?
If you are using the OneNote desktop app for Windows, go to File > Options > Save & Backup, and click 'Back Up All Notebooks Now'. This creates a secure local copy of all your data before you make changes online.
