It looks like a few vendor extensions have graduated. But the Extension Register either list the new extensions name or the old extensions (and sometimes both).
The left column below is what I have in my extensions string. the right column is what i think the extension is promoted to.
table:
NV_texgen_reflection --> EXT_texgen_reflection
EXT_texture_cube_map --> ARB_texture_cube_map
SGIS_texture_edge_clamp --> EXT_texture_edge_clamp
EXT_texture_rectangle --> ARB_texture_rectangle
ATIX_texture_env_combine3 --> ATI_texture_env_combine3
ATIX_texture_env_route --> NOT FOUND
ATIX_vertex_shader_output_point_size --> NOT FOUND
SGIS_multitexture --> ARB_multitexture
SUN_multi_draw_arrays --> EXT_multi_draw_arrays
WIN_swap_hint --> NOT FOUND
These showed up while my program errored on fetching the specification from the registry.
SO, when an entensions get promoted, the old spec disappear! THen any program that look up the register would err looking for that old extension. I would have expected a old extensions to be there, with the added message saying that the extension got promoted to another extension.
I notice 3Dlabs has an updated listed of some extensions.
(comments are welcome, while i do recode my proggie.)