IE 10 can make use of the windows-8's default auto spelling corrector feature [when it is enabled].
Now, How to make chrome, notepad etc. to make use of auto spelling corrector feature of windows 8?
You cannot enable support yourself. This has to be implemented by the author of a given program.
So this means Microsoft has to make Notepad worked with this feature and likewise Google enable it to work with Chrome ( unlikely since it already has its own spell checker using Google's online dictionary ).