w64codecs doesn't actually contain any codecs

Am I missing something here? The w64codecs package doesn't actually contain any codecs at all, there are no .dll files and the package is <1MiB in size AFTER axtraction, compared to ~20MiB of compressed w32codecs package. Are those codecs only supported under i386 arch?
$ dpkg -L w64codecs
/.
/usr
/usr/lib
/usr/lib/codecs
/usr/lib/codecs/drvc.so
/usr/lib/codecs/cook.so
/usr/lib/codecs/sipr.so
/usr/share
/usr/share/doc
/usr/share/doc/w64codecs
/usr/share/doc/w64codecs/codecs-status.html
/usr/share/doc/w64codecs/changelog.Debian.gz
/usr/share/doc/w64codecs/README
/usr/share/doc/w64codecs/copyright
/usr/lib/win32