/etc/exim4/conf.d/acl/00_exim4-config_header is in exim4-config 4.89-2+deb9u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# ACL CONFIGURATION #
# Specifies access control lists for incoming SMTP mail #
######################################################################
begin acl
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