[mysmb2]

yo uso esta que es mas simple de usar, ojala te sirva
saludos




PARAMETERS: p_file LIKE RLGRAP-FILENAME

AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
CALL FUNCTION 'F4_FILENAME'
EXPORTING
field_name = 'P_FILE'
IMPORTING
file_name = p_file.