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Fix PowerPoint (PPTX) Files Not Opening from SharePoint in File Explorer
Question details
Users are unable to open newer PowerPoint (PPTX) files directly from a mapped SharePoint network drive in File Explorer, although older PPT files and direct SharePoint online access work normally.
- Product
- Microsoft PowerPoint
- Device & OS
- Windows
- Scenario
- Attempting to double-click and open PPTX presentation files stored on a mapped SharePoint network location via Windows File Explorer.
- Observed behavior
- PPTX files fail to open when launched from the mapped network location in File Explorer. However, older PPT formats open successfully, and launching the PPTX file via the 'Browse' menu inside the PowerPoint application works without issues.
Verify your network connection to the mapped SharePoint drive and test if the file opens successfully when using the 'Open > Browse' menu directly within the PowerPoint desktop application.
Adjust PowerPoint Trust Center Settings
Modifying security settings within the PowerPoint Trust Center can resolve file block and protected view restrictions that prevent network files from loading.
Network-mapped drives are sometimes treated as untrusted locations by Microsoft Office's internal security protocols. Adjusting your Protected View, Trusted Locations, and File Block settings can bypass this restriction for SharePoint drives.
Open Microsoft PowerPoint. Click on 'File' > 'Options' > 'Trust Center', and then click the 'Trust Center Settings' button.
Navigate to 'Trusted Locations' in the left pane and check the box for 'Allow Trusted Locations on my network (not recommended)'. You can also click 'Add new location' to manually add your mapped SharePoint drive letter.
Go to the 'Protected View' tab and temporarily uncheck 'Enable Protected View for files originating from the Internet' and 'Enable Protected View for files located in potentially unsafe locations'.
Click on 'File Block Settings' and ensure that the 'Open' and 'Save' boxes for newer PowerPoint Presentations (PPTX) are not checked.
Disable the File Explorer Preview Pane
The Windows File Explorer preview pane can occasionally lock PPTX files, preventing the main PowerPoint application from accessing them.
Contact Microsoft 365 Support
If the issue affects multiple PCs, user accounts, and newly created PPTX files on a Business Standard subscription, backend investigation by Microsoft is required.
Switch to WPS Presentation for Seamless File Management
If Microsoft PowerPoint continues to experience compatibility issues with your mapped SharePoint network drives, consider using WPS Office. As a lightweight, highly compatible alternative, WPS Office bypasses many of the complex security blocks native to Microsoft, allowing you to access and edit your presentations smoothly.
- 1. Download and Install: Download WPS Office Free from the official website and complete the quick installation process.
- 2. Launch WPS Presentation: Open the WPS Office suite and click on 'Presentation' to access the slideshow editor.
- 3. Open the Network File directly: Click 'Menu' > 'Open', navigate to your mapped SharePoint drive, and select your PPTX file to open it without Microsoft's Trust Center restrictions.
Frequently Asked Questions
Why do older PPT files open from SharePoint but not newer PPTX files?
PPTX files use an XML-based structure that interacts differently with Windows network mapping security protocols. Sometimes, Office's Protected View handles these newer formats strictly over WebDAV (mapped drives), causing them to fail, while the older binary PPT format bypasses this specific check.
Can I open these files directly without using a mapped drive?
Yes. You can open the files directly from the SharePoint Online web interface by clicking 'Open in Desktop App', or you can launch PowerPoint first and use the 'File > Open > Browse' method to locate the file, which usually bypasses the File Explorer error.
Is mapping a SharePoint drive still recommended by Microsoft?
Microsoft generally discourages mapping SharePoint as a network drive in File Explorer due to performance and authentication drops (WebDAV deprecation). Instead, they recommend using the OneDrive sync client to sync SharePoint document libraries directly to your PC.
