An SAP Consultant

REPORT ztest_download.
"&-------------------------------------------------------------*
"& Select-Options
"&-------------------------------------------------------------*
PARAMETERS:sel_fold TYPE string.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR sel_fold.

  CALL METHOD cl_gui_frontend_services=>directory_browse
*  EXPORTING
*    window_title         =
*    initial_folder       =
    CHANGING
      selected_folder      = sel_fold
    EXCEPTIONS
      cntl_error           = 1
      error_no_gui         = 2
      not_supported_by_gui = 3
      OTHERS               = 4
          .
  IF sy-subrc <> 0.
* Implement suitable error handling here
  ENDIF.

START-OF-SELECTION.

  WRITE sel_fold.