The default favicon.ico and robots.txt files of Daisy can be found at

<DAISY_HOME>/daisywiki/webapp/daisy/resources/

If you want to modify them, do not overwrite these files, as these changes will be lost when upgrading Daisy. Rather, put your own files in:

<wiki data directory>/resources/

If the files are found there, they will take precedence over those below DAISY_HOME.