/etc/ezmlm-browse/html/rthread-item.html is in ezmlm-browse 0.10-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | <li>%(cmdlink("#%s: %s" % (msgnum, timestr), "timestamp", "showmsg", msgnum=msgnum))s,
%(cmdlink(author, "author", "author", authorid=authorid))s
|