Hi, John - I think this was the Noteworthy Composer Forum thread you saw. I thought I'd be smart and post a reply with links, but their forum doesn't take HTML like ours does. Oh, well.
Anyhow, MIDITXT doesn't do what the writer wants, which is to convert ABC to MIDI or Noteworthy's NWC format. In fact, we've had some problems using MIDITXT to convert MIDI files made on Noteworthy to ABC. They play OK, but they aren't correct ABC notation. Alan Foster says there's something weird about the way Noteworthy makes MIDI files.
In short, it's probably not a good idea to advertise MIDITXT for now. It's a program designed specifically for posting tunes on this forum, a job it does quite well.
-Joe Offer-