AutoCAD 2026: When launching message “Catalog file ‘Support\AcFields.fdc’ is not found”

Jeff Arbogast

Issue:
AutoCAD 2026: When launching message “ Catalog file ‘Support\AcFields.fdc’ is not found/”.

Causes:
‘AcFields.fdc’ is missing or corrupt

Solution:
You can correct this by

Copying the file from another system that does not have the error.
You can find this location in
C:\Users\<User Name>\AppData\Roaming\Autodesk\AutoCAD 2026\R25.1\enu\Support
Replace the file with a file from a working system to the same location on the affected system.
Copy the file from Autodesk DataCach folder
C:\Program Files\Autodesk\AutoCAD 2026\UserDataCache\Support
To
C:\Users\<User Name>\AppData\Roaming\Autodesk\AutoCAD 2026\R25.1\enu\Support
If neither of the options work, you may need to reinstall the software.
Clean uninstall of AutoCAD or verticals
https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Clean-uninstall-of-AutoCAD-or-verticals.html

About the Author

Manufacturing Solution Center Team Lead<br><br>Jeff is responsible for manufacturing Technical Support for both internal staff and customers. In addition to the daily activities of the support center, he helps write for the National Support Center blog, and has written online classes for the IMAGINiT training on demand site.
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