dziwny Notepad++ ?

[m^2]

Bug z .txt jest znany prawie od 2 lat.
http://sourceforge.net/tracker/index.php...tid=612382
Oficjalny komentarz:

The extension filter just helps you to choose the file you
want by filtering the extension.
It needs a lot of coding effort to implement what you want,
so I won't do it. However, if someone is interesting in
doing it, he/she is welcome.

"Jest to drobny błąd, którego naprawienie wymaga dużo pracy, autor nie zamierza tego poprawiać."