Junk chars in the file posted on application server

HI All,
I am posting a file on the application server using the OPEN DATASET, TRANSFER, CLOSE DATASET commands.
The file is posted successfully but it contains junk characters like # and some box kind of character. The file that has the data doesnot have these junk characters.
Help me resolve this problem.
Thanks in advance.

this is my code...
Open the file in the application server
OPEN DATASET l_filename FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
IF sy-subrc = 0.
Convert workarea to string type
CALL METHOD CL_ABAP_CONTAINER_UTILITIES=>FILL_CONTAINER_C
    EXPORTING
      IM_VALUE               = ls_jhak
    IMPORTING
      EX_CONTAINER           = l_file
    EXCEPTIONS
      ILLEGAL_PARAMETER_TYPE = 1
      OTHERS                 = 2.
Transfer the data fetched into the file
TRANSFER l_file TO l_filename.
ELSE.
RETURN.
ENDIF.
Close the file in the application server
CLOSE DATASET l_filename.

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Junk chars in the file posted on application server

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