Abiword, I have not followed them for a few years but it was a nice, lightweight and sometimes better than open/libre office of the time. https://www.abisource.com/
There are some others but most of those are variations on the theme of libreoffice, and if the above ones are not cutting it I am bound to have MS office on a machine I control somewhere. Equally if it matters I am probably writing it on a real word processor/typesetting program anyway.
One word..Linux. A free OS and apps, I can think of at least 10 ways to view it in Linux. It doesn't bother reading file extensions, just uses the most appropriate encoding when printing the text within.
The easiest way, if you really want to keep your windows, get a copy of LibreOffice for win and open it with their 'word processor' tool.