ABAP methods to download internal table contents into Excel

 data: begin of it_header occurs 0,  
 header(30) ,  
 end of it_header.  
  move 'FIELD NAME1' to it_header-header.  
  append it_header.  
  move ' FIELD NAME2' to it_header-header.  
  append it_header.  
  move ' FIELD NAME3' to it_header-header.  
  append it_header.  
  move ' FIELD NAME4' to it_header-header.  
  append it_header.  
  move ' FIELD NAME5' to it_header-header.  
  append it_header.  
 *Method to POP Up the file path to save  
  call method cl_gui_frontend_services=>file_save_dialog  
    exporting  
 *   window_title   = ' '  
     default_extension = 'XLS'  
     default_file_name = lf_save_filename  
     initial_directory = 'c:\temp\'  
    changing  
     filename     = lf_save_filename  
     path       = lf_save_filepath  
     fullpath     = lf_save_filefullpath  
     user_action    = lf_result.  
 * Check user did not cancel request  
    check lf_result eq '0'.  
 *Function module to download the internal table data into excel  
    call function 'GUI_DOWNLOAD'  
     exporting  
       filename     = lf_save_filename  
       filetype     = 'ASC'  
 *    HEADER     = it_header  
 *    APPEND      = 'X'  
       write_field_separator = 'X'  
 *    CONFIRM_OVERWRITE = 'X'  
     tables  
       data_tab     = lt_result[]   "need to declare and populate  
       fieldnames    = it_header[]  
     exceptions  
       file_open_error = 1  
       file_write_error = 2  
       others      = 3.