Office documents (such as .pptx, .docx, .xlsx files) cannot be previewed or do not display thumbnails in Eagle, usually caused by the following reasons:

The device has not yet installed Office 2019/365 version, or the currently installed version is too old
The device has previously installed multiple versions of Office or WPS, causing registry confusion due to incomplete upgrades or uninstalls

Solutions

Method 1: Confirm Office 2019/365 version is installed

If your device does not have Office installed yet, please follow these steps to install:

Go to the Office 365 website
After logging into your account, click download
Wait for the download confirmation window to pop up, select "Other options"
Select "Office - 64-bit"
Click "Install"
Download the installation file
Double-click the installation file and wait for automatic installation to complete

Method 2: Use Office 365/2019 built-in repair tool

The built-in Office repair tool can fix registry information:

Open "Settings > Apps"
Find "Microsoft Office" in the applications list
Click and select "Modify"
Select "Quick Repair" and click "Repair"
Click the "Repair" button to confirm
Wait about three minutes for the repair to complete
Right-click on the problematic file and select "More" > "Refresh Thumbnail" to check if the issue has been fixed

Method 3: Manually delete remaining Office registry information

If the above methods are ineffective, you can try manually cleaning the registry:

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

Regardless of whether Office is activated, as long as Office is properly installed, Eagle will be able to normally add and preview doc, ppt and other files.

Solution for Unable to Preview Office Files (pptx, docx, xlsx) or Thumbnails Not Displaying