How to extract extension of file like (jpeg from c:\prashant.jpeg)

hi
please tel me that howa to extract file type from path of file
like c:\prashant.jpeg
thanks

use this code....
PARAMETERS: infile LIKE rlgrap-filename OBLIGATORY.
DATA: txt1 TYPE char200,
      txt2 TYPE char4.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR infile.
PERFORM file_browse.
START-OF-SELECTION.
SPLIT infile AT '.' INTO txt1 txt2.
WRITE: txt2.
*&      Form FILE_BROWSE
*       text
* --> p1        text
* <-- p2        text
FORM file_browse .
CALL FUNCTION 'F4_FILENAME'
     EXPORTING
       program_name        = syst-cprog
       dynpro_number       = syst-dynnr
*   FIELD_NAME          = ' '
     IMPORTING
       file_name           = infile.
ENDFORM.                    " FILE_BROWSE

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How to extract extension of file like (jpeg from c:\prashant.jpeg)

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