Thank you all
I tried re-downloading the official converter directly from the e-Sword site, but the type of file is still restricted to .bblx It is, by the way, exactly the same program as is available here on BibleSupport.
Maybe there is an older version, or somewhere else to download it from for a version that handles reference books? Maybe they changed it due to copyright issues?
As for Tooltip NT, I had installed previously the NT Tooltip but couldn't figure out how to use it, as I am not a programmer and didn't know what commands to enter. I do see that there is a whole sub-forum here with what looks like a tutorial. So that may be an option for the future if someone wants to be a power user and invest the time in it. Not me at this point.
Adding to those complications are the fact that aftr re-installing it, I now seem to have a slight bug in my NT Tooltip, that for some weird reason, it won't let me close or click "ok" on the initial developer splashscreen, so I can't open it up now anyways. Re-installing WINE didn't fix the problem. Re-installing Tooltip NT to the 4-4 version didn't fix it either. It's probably something on my computer. Perhaps it will work for someone else.
Well, thank you everyone for the tips and for trying. I do appreciate it. I'm not a programmer, so don't want to spend several more hours fiddling with these types of things. I'd rather just get to doing what I installed this program for originally - studying the Bible! Hence the wisdom of having setup both e-Sword X AND e-sWord PC both on my computer and the ability to switch back and forth.
I can heartily recommend the New Heart English Bible. Especially the updated 2016 version. Very nice. That, in conjunction with Brenton's English translation of the Greek Septuagint is a very nice combo.
Blessings to all