/etc/zutilsrc is in zutils 1.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Runtime Configuration file for Zutils
#
# Zutils looks for this file in:
# 1 - $HOME/.zutilsrc
# 2 - ${sysconfdir}/zutilsrc
# This file sets the compressor and options to be used for each format.
# The command line options override compressors specified in this file.
# Syntax: <format> = <compressor> [options]
# Uncomment each line you want to take effect.
# bz2 = lbzip2 -n2
# gz = pigz -p2
# lz = plzip -n2
# xz = pixz -p2
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