I don't know what it is about those 4 center sqaures. I get the names wrong all the tie.
What's the point?
I think to open the e file later and bring the rook to h3.
How would it lead to opening the e file?
cxd5 exd5

Thanks for your comments guys.
I see now.
I know with this opening, opening the c-file is very common. That alone should have been enough to get me to make this move. But, to be honest, at this point in the game, I was a bit lost as to what to do.

Thanks for the line Second.
The position you have eneded up with is similar to what I expect from this opening.
From the starting position; I am not really eyeing the h7 square. At the most, I am trying to force black to divert energy to defense of the king while I work on improving my queen side.
It's becoming clear this failure to take that d pawn was the root of my eventual loss in this game. I think my opponent was much more used to this type of position because he did a pretty good job of taking advantage of the weaknesses I created trying to generate some play.
cxd5 exd5 then, dxc5! And black has an isolated pawn.