Download a zip file with gui_download = CRC error

Hello erverybody,
I download a zip compressed file with gui_download (cl_gui_interface_services) in binary mode.
When I try to open it, I have a crc error. Does anybody has any idea why?
here the code:
       TYPES: begin of t_zip,
             text(1024) type c,
             end of t_zip.
      DATA: itab_zip type table of t_zip,
            wa_zip type t_zip.
      OPEN DATASET p_fileon IN BINARY MODE FOR INPUT.
      IF sy-subrc <> 0.
        MESSAGE text-e01 TYPE 'E'.
      ENDIF.
      DO.
        READ DATASET p_fileon INTO wa_zip MAXIMUM LENGTH 1024.
        APPEND wa_zip TO itab_zip.
        IF sy-subrc <> 0.
          EXIT.
        ENDIF.
      ENDDO.
      CLOSE DATASET p_fileon.
      MOVE p_filedw TO filename.
      CALL METHOD cl_gui_frontend_services=>gui_download
        EXPORTING
          filename                  = filename
          FILETYPE                  = 'BIN'
        CHANGING
          data_tab                  = itab_zip
Thanks
Joachim

Hi Joachim,
1. use this code (just copy paste in new program)
2. It will download from SERVER to front-end.
3.
*& Report YBCR_FILEDOWNLOAD                                           *
REPORT ybcr_filedownload                       .
DATA
DATA : file_name TYPE string.
DATA : BEGIN OF itab OCCURS 0,
       ln(255) TYPE c,
       END OF itab.
SCREEN
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
PARAMETERS : appfn(150) TYPE c LOWER CASE OBLIGATORY.
PARAMETERS : p_file LIKE rlgrap-filename OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b1.
AT SELECTION SCREEN
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.
CLEAR p_file.
CALL FUNCTION 'F4_FILENAME'
    IMPORTING
      file_name = p_file.
file_name = p_file.
START-OF-SELECTION
START-OF-SELECTION.
OPEN DATASET appfn FOR INPUT IN TEXT MODE ENCODING DEFAULT .
IF sy-subrc <> 0.
    MESSAGE s999(yhr) WITH 'COULD NOT OPEN FILE ON APP SERVER'.
    LEAVE LIST-PROCESSING.
ENDIF.
DO.
    READ DATASET appfn INTO itab.
    IF sy-subrc = 0.
      APPEND itab.
    ELSE.
      EXIT.
    ENDIF.
ENDDO.
file_name = p_file.
CALL FUNCTION 'GUI_DOWNLOAD'
    EXPORTING
BIN_FILESIZE                    =
      filename                        = file_name
FILETYPE                        = 'ASC'
APPEND                          = ' '
WRITE_FIELD_SEPARATOR           = ' '
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                       = ' '
TRUNC_TRAILING_BLANKS_EOL       = 'X'
WK1_N_FORMAT                    = ' '
WK1_N_SIZE                      = ' '
WK1_T_FORMAT                    = ' '
WK1_T_SIZE                      = ' '
IMPORTING
FILELENGTH                      =
    TABLES
      data_tab                        = itab
FIELDNAMES                      =
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 <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
regards,
amit m.

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