What rendering API does Rage use on PC?

Is Rage for PC using OpenGL or DirectX? From all the Radeon card troubles, I would presume the former, but I would like to be sure.

If you have the game, you can tell which one it is by by opening the exe with the Dependency Walker and checking whether it links to opengl32.dll or d3dx.dll. Also, Process Explorer can determine the loaded DLLs for a running game.

Solution 1:

RAGE uses the Id Tech 5 engine, which is based of on OpenGL.

From Wikipedia

Rage is a first-person shooter video game by id Software which was released on October 4, 2011 in North America. It uses the company's new OpenGL based id Tech 5 engine

Here's the .exe from Dependency Walker: