How to make Internet Explorer not open extensions

How to make Internet Explorer not open extensions

So, I had been using Notepad++ to open many be files - say, .txt, or .log,
for example. And that is how I like it. One day, though, internet explorer
suddenly started opening them, which I most certainly don't want. I think
it might have started after an update.
Note, Windows 7, and IE 10.
So, in default programs, IE isn't set for anything like those - the only
things that are set I cannot seem to remove. Anyway, .txt and friends -
including .html - are not checked.
So, I don't know how to get it off. It USED to work. I tried reverting to
IE 9, but the problem remains.
Note, in the description, it says Notepad++ Document, but the logo is of
IE, and it opens in IE.
Any ideas?
Some pictures I cannot seem to post:
http://snag.gy/9Ja1d.jpg http://snag.gy/dFCPB.jpg
Apparently I cannot post more than two links either.