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How to Fix OneDrive Files On-Demand Access Denied Error in Python
Question details
The user needs to resolve an access denied issue (Windows error 395) that occurs when a Python script attempts to open files stored in OneDrive using the Files On-Demand feature.
- Product
- OneDrive
- Device & OS
- Windows
- Scenario
- Running a Python script to process or read cloud-only files located in a local OneDrive synced folder.
- Observed behavior
- The Python script fails with Windows error 395 (Access Denied), even though accessing the exact same file paths via a standard terminal works successfully.
Verify that your OneDrive desktop application is actively running, signed in, and currently synced before attempting to run your scripts.
Consult the Microsoft Q&A OneDrive Management Community
Because this issue involves advanced interactions between Python file I/O operations and the Windows OneDrive client, the official Microsoft developer forum is the best place for a resolution.
Windows error 395 often occurs when programmatic file access (like a Python open() function) fails to trigger the automatic download of a cloud-only file. Standard command terminals often use the Windows Shell, which correctly signals OneDrive to fetch the file.
Open your web browser and go to the official Microsoft Q&A platform.
Search for the 'OneDrive Management' section or directly use the tag: office-onedrive-management.
Submit a new question detailing your Python script snippet, the exact Windows error 395 message, and noting that terminal access works.
Force Files to Download Locally as a Workaround
Bypass the Files On-Demand access denied error by manually ensuring the target files are fully downloaded to your local hard drive before the Python script accesses them.
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Frequently Asked Questions
What does Windows error 395 mean in OneDrive?
Error 395 typically indicates an access denied issue related to OneDrive Files On-Demand. It occurs when a third-party application (like Python) attempts to open a cloud-only file but lacks the proper system calls to trigger the automatic download.
Why does the file path work in the terminal but not in Python?
The terminal utilizes the Windows Shell, which natively understands OneDrive placeholders and automatically fetches the file on-demand. Standard file I/O operations in Python often bypass the shell, resulting in an access denied error when the physical file data is missing.
Can I disable OneDrive Files On-Demand to prevent this error?
Yes, you can disable Files On-Demand by opening OneDrive Settings, going to the 'Sync and back up' tab, and selecting 'Download all files'. Note that this will download your entire OneDrive contents to your PC, consuming local storage space.
How can I programmatically download a OneDrive file in Python?
Instead of relying on the local synced path to trigger the download, developers often use the Microsoft Graph API within their Python scripts to authenticate and securely download the file directly from the cloud.
