The configuration files for the Duplicate Check module are in ini format. You can also use a simple text editor to edit these files. The file with the settings for the duplicate check module can be found in the configuration directory under the file name
We recommend that you always use the interface for configuration even when using the duplicate check module as cli.
In the support case of a duplicate check, we may request these files to recreate your exact configuration. As mentioned in the Duplicate Check debug case, these files may contain sensitive data. Please make sure that the files are protected from unauthorized access.
Please make sure that you have always backed up configuration files of the duplicate checker when you change them manually.