Doesn't ARB mean that they are part of the core api? I didn't think these sorts of things were optional.
Edit: Same goes for GL_ARB_debug_output and GL_ARB_cl_event. I'm starting to wonder what the phrase "OpenGL 4.2" support is even supposed to mean.
[AMD HD 5850 / Windows 8 / 3.3/4.2 Core Profile Forward Compat]
Edited by Chris_F, 27 September 2012 - 12:19 PM.