Can't open this file. outlook.office.com can't open files in this folder because it contains system files

Question

Can't open this file. outlook.office.com can't open files in this folder because it contains system files

Mohammad Adil 25

Locked Question. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

Mohammad Adil 25 Reputation points

2025-10-14T12:52:05.9133333+00:00
User attempted to save attachments to a synced SharePoint folder (user is the owner).

Copying files manually to the same location works without issues.

Error occurs when saving attachments via Outlook to the folder added as a OneDrive shortcut in File Explorer.

Cleared Outlook cache, repaired and reset the Outlook app – issue persists.

Performed clean uninstall of Outlook, removed registry entries, restarted device, and reinstalled Outlook – no improvement.

Issue observed in both Classic Outlook and New Outlook.

Unsynced OneDrive, removed the shortcut, re-signed in, and re-added the SharePoint folder – issue remains.

Disabled Windows Security > App & Browser Control settings (Check apps/files & PUA blocking) – no effect.

Launched Outlook in Safe Mode – issue persists.

Deleted Outlook XML files from %appdata%\Microsoft\Outlook and restarted Outlook – no change.

Ran Inbox Repair Tool (SCANPST.EXE) from C:\Program Files\Microsoft Office\root\Office16 – issue still present.

Disconnected the user account from the device which is Entra joined and re-added - no luck

Performed the clean format and then tried again and didn't get any chance to identify the issue.

Please note that we are able to save the file locally. If anyone facing the same issue, please share the fix for it.

Answer accepted by question author

Tamara-Hu 17,960 Microsoft External Staff Moderator

Hello @Mohammad Adil,

Good day! Thank you for posting your valuable question on Microsoft Q&A forum.

Thank you for sharing the detailed steps you've already taken to troubleshoot this issue. I can see you've been very thorough, and I appreciate the effort you've put in.

Given the complexity of the problem and the fact that it persists despite extensive troubleshooting, including reinstalling Outlook, resetting OneDrive shortcuts, and modifying system settings, it appears this may require deeper analysis beyond what we can perform here in the Microsoft Q&A forum.

As a forum moderator, I have limitations in accessing backend systems and diagnostic tools necessary to fully investigate this issue. Therefore, I recommend reaching out directly to Microsoft Technical Support. Their team has the tools and access needed to perform advanced diagnostics and provide a tailored solution.

You can contact Microsoft Support for Business account by following these steps:

Find Your Microsoft 365 Admin: If you’re unsure who the Microsoft 365 Admin is within your organization, you can find guidance on locating them here: How do I find my Microsoft 365 admin? - Microsoft Support.  
Submit a Service Request: The Microsoft 365 Admin should create a service request with Microsoft support to get advanced technical assistance and diagnostics. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin.

Note: If you’re an end-user, please coordinate with your Microsoft 365 Admin to handle these steps.   

I apologize for redirecting you, but this is the most effective way to ensure you receive timely and appropriate assistance.

Please feel free to update us here if you receive a resolution from support, your experience could help others facing similar issues.

Thank you again for reaching out to us!

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Mohammad Adil 25 Reputation points

2025-10-14T13:58:25.43+00:00

Thank you for your feedback. I have raised a request with the support team and waiting for their response.
Tamara-Hu 17,960 Reputation points Microsoft External Staff Moderator

2025-10-14T14:33:02.2933333+00:00

Hi @Mohammad Adil,
Thank you for your response.
If need any further assistance or having trouble contacting the support team, you can reply and let me know. I'll be happy to help you with this support process.
If you’re still facing any difficulties or have come across new challenges, feel free to create another thread. We are always here to help!
Have a nice day and stay healthy!

1 additional answer

Mohammad Adil 25 Reputation points

2025-10-14T12:52:05.9133333+00:00

User attempted to save attachments to a synced SharePoint folder (user is the owner).

Copying files manually to the same location works without issues.

Error occurs when saving attachments via Outlook to the folder added as a OneDrive shortcut in File Explorer.

Cleared Outlook cache, repaired and reset the Outlook app – issue persists.

Performed clean uninstall of Outlook, removed registry entries, restarted device, and reinstalled Outlook – no improvement.

Issue observed in both Classic Outlook and New Outlook.

Unsynced OneDrive, removed the shortcut, re-signed in, and re-added the SharePoint folder – issue remains.

Disabled Windows Security > App & Browser Control settings (Check apps/files & PUA blocking) – no effect.

Launched Outlook in Safe Mode – issue persists.

Deleted Outlook XML files from %appdata%\Microsoft\Outlook and restarted Outlook – no change.

Ran Inbox Repair Tool (SCANPST.EXE) from C:\Program Files\Microsoft Office\root\Office16 – issue still present.

Disconnected the user account from the device which is Entra joined and re-added - no luck

Performed the clean format and then tried again and didn't get any chance to identify the issue.

Please note that we are able to save the file locally. If anyone facing the same issue, please share the fix for it.
Mohammad Adil 25 Reputation points

2025-10-14T13:58:25.43+00:00

Thank you for your feedback. I have raised a request with the support team and waiting for their response.
Tamara-Hu 17,960 Reputation points Microsoft External Staff Moderator

2025-10-14T14:33:02.2933333+00:00

Hi @Mohammad Adil,
Thank you for your response.
If need any further assistance or having trouble contacting the support team, you can reply and let me know. I'll be happy to help you with this support process.
If you’re still facing any difficulties or have come across new challenges, feel free to create another thread. We are always here to help!
Have a nice day and stay healthy!

Answer 1

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