>>On a Mac you can preview (read only, not edit) a Word doc in Finder (Mac version of File Explorer).
>
>Ok, thanks, so if I need to send a Word document so the Mac user will be able to take it from there, this is not possible. Is that correct?

It works on a Mac without Office or compatible app installed as long as they don't need to edit it (read/preview only). Seems to work well. If there end up being issues, like complex usages within Word that don't preview properly (which I have not experienced), then I suggest saving as PDF to send instead of a doc/docx.