Remove the ddeexec key from the Registry:
- Close Final Draft, if it's open;
- Go to the Start button and type "regedit" (without quotes) into the Search Windows box;
- Open the Registry Editor;
- In the tree, navigate to: HKEY_CLASSES_ROOT \ Final Draft.Document \ Shell \ Open;
- Delete the ddexec folder;
- Close the Registry Editor;
- Double-click on a script icon to open it. The error message should not appear.