I accidently forgot to uncheck the "Always use the selected program to open this kind of file" box.

Which I once did with opening .dll with notepad.
I could fix that in the registry, and I try the same thing with .bin without results.
So if anyone could find how to reset this back to normal (.bin opens with nothing) please explain how.

On Explorer | Tools | Folder Option... | File Types | Select BIn and Delete

Another option

Right Click on the .Bin file
Select "Open With"
Select "Choose Program..."
Locate your program in the list
Single click to highlight the selected program
Tick the box: "Always use the selected program.."
OK

I have windows 7, forgot to tell.
I found Folder Options, but theres nothing about File Types.

Yes, I know that
But I'm supposed to change this back to normal (i.e open with nothing).

Yes that would have helped earlier on

Anyway, here you go:
http://www.sevenforums.com/tutorials/18860-open-add-remove-always-use-selected-program.html

Did you want me to write in the post here too?
Because that link has pics and all

Thank you sir!
With a bit of resource using your link, and links on that page..
I solved my problem, and found out other ways to correct similar problems.

For others experiencing this, I will post a new Thread containing useful information about this.
//Will post link here soon.

EDIT: Click here if you're having this or a similar problem.