The MID file contains data, one record of data per row, delimited by the character specified in the delimiter statement. The default delimiter is Tab. Each row in the MID file is associated with a corresponding object in the MIF file; first row with first object, second row with second object.
If delimiter character is included as part of the data in a field, enclose the field in quotation marks.
The MID file is an optional file. When there is no MID file, all fields are blank.