Save XLS Files to Presentation Server

REPORT  zteste.

DATA: your_file_name TYPE string,
      your_file_path TYPE string,
      the_full_path  TYPE string.

TYPES:

BEGIN OF the_alv_structure,
  field1(10) TYPE c,
  field2(10) TYPE c,
END OF the_alv_structure.

DATA: the_alv_itab TYPE TABLE OF the_alv_structure.
DATA: wa LIKE LINE OF the_alv_itab.

wa-field1 = 'A1'.
wa-field2 = 'B1'.
APPEND wa TO the_alv_itab.

wa-field1 = 'A2'.
wa-field2 = 'B2'.
APPEND wa TO the_alv_itab.

wa-field1 = 'A3'.
wa-field2 = 'B3'.
APPEND wa TO the_alv_itab.

CALL METHOD cl_gui_frontend_services=>file_save_dialog
  EXPORTING
    default_extension = '.xls'
    default_file_name = 'Text'
  CHANGING
    filename          = your_file_name
    path              = your_file_path
    fullpath          = the_full_path.

CALL METHOD cl_gui_frontend_services=>gui_download
  EXPORTING
    filename              = the_full_path
    write_field_separator = 'X'
  CHANGING
    data_tab              = the_alv_itab.