I just tried this with Powerpoint from Office XP, SP3. It didn't work, and I asked why here.
Well, I've figured it out. Things I did wrong:
(a) You do have to write a .txt file. I was trying to get PowerPoint to understand a .brn file, which it doesn't do.
(b) You really do have to only write selected entries. (Did that wrong a few times, too.) If you don't, the root becomes the title of the single slide you get. Silly Powerpoint.
Anyway, I've now got it under control, and I could wish there were as simple a way to import into Word. But that's for the WIBNI forum.
Thanks for a simple, useful product.