The field names can be found in different places of the file. If the first record contains the field names, embedded labels should be used. If there are no field names to be found, no labels should be used. In dif files, a separate header section with explicit field names is sometimes used. In such a case, explicit labels should be used. If nothing is specified, embedded labels is assumed, also for dif files.
LOAD * from a.txt (unicode, txt, delimiter is ',' , embedded labels
LOAD * from a.txt (codePage is 1252, txt, delimiter is ',' , no labels)