아래와 같이 해보세요.

Method를 사용한 방법입니다.

  DATA: lv_subrc                LIKE sy-subrc,
        lv_has_field_separator  TYPE char01,
        lv_filename             TYPE string,
        lv_path                 TYPE string,
        lv_fullpath             TYPE string,
        lv_default_extension    TYPE string,
        lv_file_filter          TYPE string,
        lv_initial_directory    TYPE string,
        lv_default_file_name    TYPE string,
        lt_file_table           TYPE filetable,
        ls_file_table           TYPE LINE OF filetable.

  lv_default_extension  = 'TXT'.
  lv_default_file_name  = '*.TXT'.
  lv_initial_directory  = 'C:'.
  CONCATENATE cl_gui_frontend_services=>filetype_all
              cl_gui_frontend_services=>filetype_text
              cl_gui_frontend_services=>filetype_excel
         INTO lv_file_filter.

  CALL METHOD cl_gui_frontend_services=>get_upload_download_path
    CHANGING
      upload_path                 = lv_initial_directory
      download_path               = lv_path
    EXCEPTIONS
      cntl_error                  = 1
      error_no_gui                = 2
      not_supported_by_gui        = 3
      gui_upload_download_path    = 4
      upload_download_path_failed = 5
      OTHERS                      = 6.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
               WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    EXIT.
  ENDIF.

  CALL METHOD cl_gui_frontend_services=>file_open_dialog
    EXPORTING
*      window_title            =
      default_extension       = lv_default_extension
      default_filename        = lv_default_file_name
      file_filter             = lv_file_filter
*      with_encoding           =
      initial_directory       = lv_initial_directory
*      multiselection          =
    CHANGING
      file_table              = lt_file_table
      rc                      = lv_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.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
               WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
    EXIT.
  ELSE.
    READ TABLE lt_file_table INTO ls_file_table INDEX 1.
    IF sy-subrc = 0.
      lv_filename  = ls_file_table-filename.
    ELSE.
      EXIT.
    ENDIF.
  ENDIF.

대체 펑션은 위에 소스에 나와 있는 method 사용 하시면되고요

그냥 사용해도 무방은 합니다. 허나 unicode 관련되서 이런저런 오류들이 많이 발생합니다.

예를 들면 2byte 상태에 문자와 1byte 문자들이 포함된 data를 내려 받을경우 기존과는 다른게 데이터가 생성이되곤합니다.

참고 허세용~

오.. 감사합니다!!!