/etc/postfix/postfix-files.d/mysql.files is in postfix-mysql 3.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | $shlib_directory/postfix-mysql.so:f:root:-:755
$manpage_directory/man5/mysql_table.5.gz:f:root:-:644
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