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[Thomas]

Sorry for the long time it took to make a reply, but here is the rundown of most OGL extension that are used. Also note that different quality modes require different shaders. Lower quality uses less extension

ARB_texture_rectangle
ARB_vertex_buffer_object
EXT_stencil_two_side or ATI_separate_stencil (there is fallback for this though)
EXT_texture_filter_anisotropic (only used when turned on)
ARB_multisample (only used for FSAA)
ARB_vertex_program
ARB_fragment_program (not used for low quality)
NV_register_combiners (only used for low)
ATI_fragment_shader (low only)