ok i find how to do

make et mybat.bat
start
@ECHO OFF
del repertoire.txt
copy generateur.fab repertoire.txt
dir /on/b name_repertory >> repertoire.txt

make et generateur.fab (just a .txt name in .fab or what ever you wnat)

variable=
only this line

when you run mybat.bat it display an dlist file contents of name_directory and pppput the value find in repertoire.txt