Print Internal Table to Excel File in ABAP

PARAMETERS  : LV_FILE1(50).
DATA: LV_FILE TYPE STRING.
LV_FILE = LV_FILE1.

CALL METHOD CL_GUI_FRONTEND_SERVICES=>GUI_DOWNLOAD
  EXPORTING
    FILENAME                  = LV_FILE
    FILETYPE                  = 'DAT'
  CHANGING
    DATA_TAB                  = ITAB[].