How to create column header text while downloading file

How can we create column header text while downloading file using function GUI_DOWNLOAD(in SAP Release 4.6c) because there is no FIELDNAMES parameter in
4.6c version.

Hii,
Check this sample code. I have called GUI_DOWNLOAD twice. Onetime to download header of table and next time data of table
REPORT z_file_download.
DATA: w_name(90) TYPE c.
DATA:
BEGIN OF fs_flight,
    carrid   LIKE sflight-carrid,
    connid   LIKE sflight-connid,
    fldate   LIKE sflight-fldate,
    price    LIKE sflight-price,
    currency LIKE sflight-currency,
END OF fs_flight.
DATA:
BEGIN OF fs_head,
    carrid(10) TYPE c,
    connid(10) TYPE c,
    fldate(10) TYPE c,
    price(10) TYPE c,
    curr(10) TYPE c,
END OF fs_head.
DATA:
t_head LIKE
   TABLE OF
         fs_head.
DATA:
t_flight LIKE
     TABLE OF
           fs_flight.
fs_head-carrid = 'CARRID'.
fs_head-connid = 'CONNID'.
fs_head-fldate = 'FLDATE'.
fs_head-price = 'PRICE'.
fs_head-curr   = 'CURRENCY'.
APPEND fs_head TO t_head.
SELECT-OPTIONS:
s_carrid FOR fs_flight-carrid.
START-OF-SELECTION.
SELECT carrid
         connid
         fldate
         price
         currency
    FROM sflight
    INTO TABLE t_flight
   WHERE carrid IN s_carrid.
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
*   BIN_FILESIZE                  =
    filename                      = 'D:\flight.xls'
   FILETYPE                      = 'ASC'
*   APPEND                        = ' '
    WRITE_FIELD_SEPARATOR         = 'X'
*   HEADER                        = '00'
*   TRUNC_TRAILING_BLANKS         = ' '
*   WRITE_LF                      = 'X'
*   COL_SELECT                    = ' '
*   COL_SELECT_MASK               = ' '
*   DAT_MODE                      = ' '
*   CONFIRM_OVERWRITE             = ' '
*   NO_AUTH_CHECK                 = ' '
*   CODEPAGE                      = ' '
*   IGNORE_CERR                   = ABAP_TRUE
*   REPLACEMENT                   = '#'
*   WRITE_BOM                     = ' '
* IMPORTING
*   FILELENGTH                    =
tables
    data_tab                      = t_head
EXCEPTIONS
   FILE_WRITE_ERROR              = 1
   NO_BATCH                      = 2
   GUI_REFUSE_FILETRANSFER       = 3
   INVALID_TYPE                  = 4
   NO_AUTHORITY                  = 5
   UNKNOWN_ERROR                 = 6
   HEADER_NOT_ALLOWED            = 7
   SEPARATOR_NOT_ALLOWED         = 8
   FILESIZE_NOT_ALLOWED          = 9
   HEADER_TOO_LONG               = 10
   DP_ERROR_CREATE               = 11
   DP_ERROR_SEND                 = 12
   DP_ERROR_WRITE                = 13
   UNKNOWN_DP_ERROR              = 14
   ACCESS_DENIED                 = 15
   DP_OUT_OF_MEMORY              = 16
   DISK_FULL                     = 17
   DP_TIMEOUT                    = 18
   FILE_NOT_FOUND                = 19
   DATAPROVIDER_EXCEPTION        = 20
   CONTROL_FLUSH_ERROR           = 21
   OTHERS                        = 22
IF sy-subrc NE 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
      filename                = 'D:\flight.xls'
      filetype                = 'ASC'
      append                  = 'X'
      write_field_separator   = 'X'
    TABLES
      data_tab                = t_flight
    EXCEPTIONS
      file_write_error        = 1
      no_batch                = 2
      gui_refuse_filetransfer = 3
      invalid_type            = 4
      no_authority            = 5
      unknown_error           = 6
      header_not_allowed      = 7
      separator_not_allowed   = 8
      filesize_not_allowed    = 9
      header_too_long         = 10
      dp_error_create         = 11
      dp_error_send           = 12
      dp_error_write          = 13
      unknown_dp_error        = 14
      access_denied           = 15
      dp_out_of_memory        = 16
      disk_full               = 17
      dp_timeout              = 18
      file_not_found          = 19
      dataprovider_exception = 20
      control_flush_error     = 21
      OTHERS                  = 22.
IF sy-subrc EQ 0.
    MESSAGE 'Download successful' TYPE 'I'.
ENDIF.
IF sy-subrc NE 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
Regards
Abhijeet

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