Given there doesn't appear to be a specific purpose or use case for these files that is in-scope for Wikimedia projects, it seems like the only use case is sharing of files within chapters or WMF, or for historical purposes preserving the file used for a particular publication in a way that is publicly accessible.

If any private or internal wiki wants to allow upload of such files for those reasons, I'm sure that could be arranged with less concern for security.

If WMF wants to host these files on wikimediafoundation.org, I'm sure that could be arranged as well with relative ease since that wiki, despite being public, could have its upload capacity limited to a certain subset of users.

However for any regular public wiki I don't think this will happen given there wouldn't be any way to preview these files or otherwise use them in a way that seems in-scope. If Wikimedia Commons feels otherwise (e.g. for preservation reasons if a certain archive happens to be in this format), I'm sure this could be considered, but in that case we'll need to find resources to do a proper security audit and potentially a way to preview these files through thumbnails would be useful in that case.

Until such request comes, closing this for now, given it was filed originally in 2009 with little activity since.