FILE OPEN DIALOG

  DATA lta_ftable TYPE filetable.
  FIELD-SYMBOLS <fs_ftable> TYPE file_table.

  REFRESH lta_ftable.
  CALL METHOD cl_gui_frontend_services=>file_open_dialog
*    EXPORTING
*      window_title            =
*      default_extension       =
*      default_filename        =
*      file_filter             =
*      with_encoding           =
*      initial_directory       =
*      multiselection          =
    CHANGING
      file_table              = lta_ftable
      rc                      = sy-subrc
*      user_action             =
*      file_encoding           =
     EXCEPTIONS
       file_open_dialog_failed = 1
       cntl_error              = 2
       error_no_gui            = 3
       not_supported_by_gui    = 4
       OTHERS                  = 5
          .
  CHECK sy-subrc = 0.

  READ TABLE lta_ftable ASSIGNING <fs_ftable> INDEX 1.
  CHECK sy-subrc = 0.