It appears that you’re trying to imply that OpenGL is not supported on Windows. I’m not even sure how to answer such ridiculousness.
Microsoft has tried it's best to kill it - after all there was absolutely no need for Direct3D given that OpenGL was already there. But Microsoft saw fit to foist an inferior API on 3D developers, and needlessly fragment the community.
Microsoft has done everything it can to make OpenGL a second class citizen on Windows. For instance, you couldn't use the 3D features of the Windows Vista interface if you were running an OpenGL program. I'm not sure if it was fixed in Windows 7, it's no longer an issue for me.
OpenGL has a strong position on Mac, Linux, Unix and mobile devices, so its future is no longer in doubt. No thanks to Microsoft.