Hooking Windows and Changing Chars

[Crunk]

Howdy, I have a little side project, but I'm not sure where too start. Assuming I've disabled UAC and all that fun stuff on my Windows 7 machine, I want to hook every window and replace a certain character, with another character. To be more precise, I want to kill emojis off of my machine.

I hate those stupid little cartoon expressions in every other line of text, and I want to know where I should start so I can stop seeing those things.

I have some experience with C++, and C. I want to impact the system as little as possible and hook windows that are not currently active. Are there any libraries that handle this functionality already?

Thanks for your time.