Was just going through the Skyrim folder and it has a dx 10 folder within it. When i clicked on the folder i saw a bunch of dx11 and dx10 folders in it. Thought it was only a dx9 game?

I believe they are using DX10/11 for optimization purposes only not features like tessellation.

edit: forgot /11

It is graphically. It used some of the optimization included in the dx 10 and 11, but none of the graphical improvements.