When Cinema 4D files fail to display thumbnails in Eagle, it's typically due to incomplete C4D software component installation. Follow these steps to quickly resolve this issue.

Solution Steps

Open your Cinema 4D installation directory and navigate to the "\resouces\libs\win64" folder to find the "win_thumbnail.dll" file
Copy the "win_thunail.dll" file and paste to the "C:\Windows\System32\" folder
Click "Windows Icon", then type to search CMD, right-click on the "Command Prompt" and select "Run as administrator
Enter "regsvr32.exe C:\Windows\System32\win_thumbnail.dll" to run the command
A success message will appear when the registration is complete
Return to Eagle, right-click on the C4D files with missing thumbnails, select "More" and click "Refresh Thumbnail". The thumbnails should now display properly.

Important Notes

This method requires administrator privileges to execute
If the issue persists, ensure your Cinema 4D version is compatible with your operating system
For newer versions of Cinema 4D, the DLL file path may differ slightly; adjust according to your actual installation location

Eagle sometimes may not correctly generate thumbnails for Cinema 4D files. This guide provides troubleshooting steps to help you resolve this issue.

Diagnosing the Problem

Before trying solutions, first verify if the issue is limited to Eagle:

In Eagle, select the problematic C4D file, right-click and choose "Reveal in Finder"
In Finder, locate the C4D file and press the Space bar to preview it
- If the preview doesn't work in Finder either, this indicates a system-level issue related to macOS file preview functionality
- If the file previews normally in Finder, the issue is likely specific to Eagle

Solutions

Method 1: Check Cinema 4D Software Installation

Eagle relies on Cinema 4D's native support to generate previews. Please verify that:

Cinema 4D is installed on your computer
Your installed version of Cinema 4D is compatible with your files
Your Cinema 4D software is updated to the latest version

Method 2: Resave the File

Right-click on the problematic file and select "Open with Default APP" or "Open With" to open it in Cinema 4D
Resave the file to its original location to update the thumbnail information
Return to Eagle, right-click on the file and select "More" > "Refresh Thumbnail"

Unable to preview Cinema 4D (.c4d) files