I don't know what is a TOC refresh but I learn quickly

( if you spent some words to explain me ( or give a link ) much and much more quickly

).
I have downloaded the patch we are talking about ( i have not used that ) and could you tell me what is the use of this file ?
" -rw-rw-r-- 1 internet internet 8017894 13 feb 2004 DRK-FSP.PPF "
I did guess its use was to replace a file in the ISO but I haven't found it in the ISO itself therefore think it must be processed with some program.
Am I wrong ? If yes i hope you get me right, else, where can i find the program ?
Thanks a lot. Bye