A log file is systematically created at the end of the processing. It indicates:
the folders,
the setup used: pivots, selections, etc.
For each imported file:
the number of lines read/processed/rejected
the name of the reject file,
the list of the rejected lines with the explanation.
If this check box is selected, the file is opened at the end of the processing launched in interactive mode. Otherwise, it is created but opened only if errors occur.