Thanks, this explains the mystery, and now the timelines add up.

So it turns out, EDIT.COM was one of the first - if not the first - computer programs I ever saw and used, back when the first PC showed up in the house. For some reason, someone in the family guessed that 9yo me will be interested in DOS and QBasic. A few years later, I used it from Windows for some time, when I was learning X86 assembly (I wanted to learn how to make a video game, so I went to the local library looking for some "intro to programming" book, and mistakes were made).

Afterwards, it was Borland C++ 3.1 (another TUI classic) and vim/Emacs, and I forgot about EDIT.com entirely. This new Microsoft Edit is something new, and something else, but similar enough that it brought those memories back.

Thanks again!