Texture Pack Trying to make a resource pack that affects shaders

[OrderlyChaos]

So I've done some searching and tinkering with the game content files myself but I'm not sure how to open PixelShader.xnb, ScreenShader.xnb and TileShader.xnb. I think changing those files will allow me to create shaders (fullbright, dst world overlay etc) in vanilla Terraria without the use of mods. Does anyone know how to view or edit said files or other methods of applying shaders to vanilla Terraria?

 

[Melstar]

I did some research some time ago about these and I found literally nothing. I imagine it's one of those things that nobody has actually tried changing so we know nothing about it. Either that or it can only be changed with mods. Someone with more knowledge on coding should be able to give you a proper answer.
If someone does have some info on this I would like to know as well.