How to know if a file exists before uploading or downloading

Is there FM to know it a file exists or not before doing anything with it?
thanks

Hi,
       use call function GUI_upload if file present
      sy-subrc will be 0 ELSE fm RESULTS IN ERROR
     ALL FUNCTION 'GUI_UPLOAD'
       EXPORTING
            filename                = filename
            filetype                = 'ASC'
       TABLES
            data_tab                = cofdata
       EXCEPTIONS
            file_open_error         = 1
            file_read_error         = 2
            no_batch                = 3
            gui_refuse_filetransfer = 4
            invalid_type            = 5
            no_authority            = 6
            unknown_error           = 7
            bad_data_format         = 8
            header_not_allowed      = 9
            separator_not_allowed   = 10
            header_too_long         = 11
            unknown_dp_error        = 12
            access_denied           = 13
            dp_out_of_memory        = 14
            disk_full               = 15
            dp_timeout              = 16
            OTHERS                  = 17.
IF sy-subrc <> 0.
    MESSAGE i110 WITH sy-subrc 'cofile' filename.
    EXIT.
ENDIF.
Regards
amole

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