/usr/lib/mime/packages/links is in links 2.8-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | text/html; /usr/bin/links %s; needsterminal; description=HTML Text; nametemplate=%s.html; priority=4
text/html; /usr/bin/links -dump %s; copiousoutput; description=HTML Text; nametemplate=%s.html; priority=3
|