/usr/share/polymake/bundled/nauty/polymake.ext is in polymake-common 3.2r2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Computation of automorphism groups of graphs.
Copyright by Brendan McKay and Adolfo Piperno.
http://pallini.di.uniroma1.it/
# This is a common tag for bliss and this extension
REPLACE
bundled:graph_compare
# This extension provides the same functionality as the bliss extension,
# and they cannot be active at the same time.
CONFLICT
bundled:bliss
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