/var/lib/tex-common/fmtutil-cnf/texmf/latex209.cnf is in latex209-bin 25.mar.1992-17.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# LaTeX 2.09
#
# format engine pattern-file arguments
latex209 tex - latex209.ini
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