Does EE have a interface for secondary development, or how can I access the files with suffix code of out. ?
I am not fully sure what you are referring to when you say “secondary development”. *.out files are the output files generated by EFDC_DSI / EFDC+ which are used by EFDC_Explorer to view the results. *.out files are binary files so if you want to extract output from these files, there is a utility names GETEFDC on this website under Downloads | EFDC Model | Utilities which allows you to extract the output at specific cells / whole domain.
I hope this helps.