I asked the same for Notepad++, but in fact I don't mind changing of software.
I am interested in managing txt files that contain Markdown. I would like to find an editor of txt files for Windows that is able to highlight Markdown syntax and, what is more important, to collapse on headings, etc.
I am flexible about the Markdown flavour, I mean, I don't mind if it is strict Markdown or Multimarkdown, etc.
The problem is I've never been really interested in txt editor. I actually use Notepad++, but don't know many tricks.
Now I am considering the possibility of using txt files for keeping some kind of information, and it would be great if I could find a way of collapse sections defined by using Markdown. My goal behind all this is being more productive, of course.
I am not sure if maybe Vim or other similar programs can be helpful...