/usr/share/syslinux/themes/debian-squeeze/isolinux-live/isolinux.cfg is in syslinux-themes-debian-squeeze 12-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | include menu.cfg
default vesamenu.c32
prompt 0
timeout 0
|