This file is indexed.

/usr/share/ltsp/plugins/ltsp-build-client/Ubuntu/030-artwork is in ltsp-server 5.4.2-6+deb7u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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case "$MODE" in
    finalization)
        if [ -n "$FAT_CLIENT_DESKTOPS" ]; then
            desktops="$FAT_CLIENT_DESKTOPS"
        else
            desktops=$(dpkg -l | sed -n 's/^ii.*\<\(.*buntu-desktop\)\>.*/\1/p')
        fi
        # Prefer artwork for desktops other than then default ubuntu one
        desktops=$(echo $desktops | sed 's/\<ubuntu-desktop\>//')
        for d in $desktops ubuntu-desktop; do
            name=${d%-desktop}
            if chroot $ROOT apt-get $APT_GET_OPTS install ldm-$name-theme; then
                break
            fi
        done
    ;;
esac