David Megginson writes;

> They were unavailable to me and to other Linux users.

Alas yes. me too. I have to consciously seek a Win PC to do this
(as Len Deighton said, conscious willing or unconscious unwilling :-)

> Ironically, I can now view MS Word 97 documents on my Linux box (using
> the new, free version of WordPerfect for Linux released last
> Thursday), but I still cannot view an SGML document + stylesheet using
> an out-of-the-box software package.

Which Corel have seen fit to omit SGML from: the PC version of WP8 has
a very nice full SGML parser, stylesheet, and edit interface...