Exactly. On windows the OpenGL implementation is supplied by the graphics vender. AMD, Nvidia, or in the case of the i7, intel.

Windows comes with an OpenGL implementation but it's an ancient version.

Well before it failed with an error about initializing graphics. When I tried a year later, that error no longer appeared but the FPS was in the single digits. I didn't dig around for special OpenGL drivers, no, I just let Intel and MS push certified drivers out via normal update mechanisms.