Thanks for that, JB. Yes, I am familiar with the various flavours of Linux. But that's not the issue here.
I happen to have acquired a Windows 8 tablet, and I thought I would use it for reading technical books and journals - the type that don't fit well on my physical Kindle's relatively small screen. That's why I was interested in the Kindle for Windows program.
I've now got the "old" version of that program working on the tablet, and it meets all my requirements.
(Next job: see how well Calibre works.)