/usr/share/syslinux/themes/debian-squeeze/isolinux-live/live.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 5 6 | default live
label live
menu label ^Live
menu default
kernel /live/vmlinuz
append initrd=/live/initrd.img boot=live config @LB_BOOTAPPEND_LIVE@
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