If you cannot preview Office files (.ppt, .doc, .xls) in Eagle or thumbnails are not displaying, this is typically caused by:

Office 2019/365 is not installed on your device, or your current version is outdated (Note: Office must be 64-bit)
Multiple versions of Office or WPS were previously installed, causing registry conflicts due to incomplete upgrades or uninstallations

Solution Methods

Method 1: Confirm Office 2019/365 Installation (Skip if already installed)

If you haven't installed Office or need to update:

Go to the Office 365 website
Sign in to your account and click download
When the download confirmation window appears, select "Other options"
Choose "Office - 64-bit"
Click "Install"
Download the installation file
Double-click the installation file to begin automatic installation

Method 2: Use Office 365/2019 Built-in Repair Tool

This method fixes registry information issues:

Open "Settings > Apps"
Find "Microsoft Office" in the application list
Click and select "Modify"
Choose "Quick Repair" and click "Repair"
Click "Repair" to confirm
Wait approximately three minutes for the repair to complete
Right-click on the problematic file, select "More > Refresh Thumbnail" to check if the issue is resolved

Method 3: Manually Delete Office Registry Remnants

If the methods above don't work, try manually fixing the registry:

Click the Windows button in the lower left corner and search for "regedit"
Click on regedit to run the Registry Editor
Enter "Computer\HKEY_CLASSES_ROOT\TypeLib{00020813-0000-0000-C000-000000000046}" in the path field and press Enter
In the "00020813-0000-0000-C000-000000000046" folder, find folders named 1.8 and 1.7 (keep 1.9 and above) and right-click to delete them
Right-click on the problematic file, select "More > Refresh Thumbnail" to check if the issue is resolved

Method 4: Resave the File

Sometimes simply resaving the file can fix the problem:

Right-click on the problematic file and select "Open with Default Application" or "Open with Other Application," then open it using Office
Save the file to its original location to update the thumbnail information
Return to Eagle, right-click on the file, and select "More > Refresh Thumbnail"

Important Notes

We recommend using the latest version of Office applications, as older versions may have compatibility issues
Eagle can properly add PPT, DOC, and XLS files as long as Office is correctly installed, regardless of activation status

When Office files (ppt, doc, xls, etc.) cannot be previewed or thumbnails are not displaying in Eagle on macOS, the issue is typically related to your system's QuickLook functionality.

Diagnosing the Issue

Before attempting solutions, verify if the problem is limited to Eagle:

In Eagle, right-click on the problematic file and select "Reveal in Finder"
In Finder, locate the PPT file and press the space bar to check if preview works normally
- If preview also fails in Finder, this indicates a system-level issue with macOS file preview functionality
- If preview works correctly in Finder, the problem is likely related to Eagle specifically

Solutions

Method 1: Reset QuickLook Service

Press "Command + Space" to open Spotlight, search for "Terminal", and open "Terminal.app"
Enter the following command and press Enter: qlmanage -r cache
Return to Eagle, right-click on the problematic file and select "More" > "Refresh Thumbnail"

Method 2: Reinstall Office Applications

Reinstalling the latest version of Microsoft Office may resolve the issue by ensuring that QuickLook plugins (.qlgenerator files) are properly installed in your system.

Method 3: Resave the File

Right-click on the problematic file and select "Open with Default Application" or "Open with Other Application" to open it with the appropriate Office application
Save the file again in its original location to update the thumbnail information
Return to Eagle, right-click on the file and select "More" > "Refresh Thumbnail"

Important Notes

We recommend using the latest version of Office applications, as older versions may have compatibility issues
Eagle can properly add ppt, doc, xls files as long as Office is properly installed, regardless of whether Office is activated

Unable to preview Office (.ppt, .doc, .xls) files