Here are the original filenames.

    D:\extensions\*.*
[defs]
[EXTspecs]
[HPspecs]
[PGIspecs]
[registry]
[rules]
[SGIspecs]

    D:\extensions\defs\*.*
glext.h
glxext.h
glxproto.h

    D:\extensions\EXTspecs\*.*
abgr.spec
blend_color.spec
blend_logic_op.spec
blend_minmax.spec
blend_subtract.spec
clip_volume_hint.spec
cmyka.spec
color_subtable.spec
color_table.spec
convolution.spec
copy_texture.spec
histogram.spec
import_context.spec
misc_attribute.spec
object_space_tess.spec
packed_pixels.spec
paletted_texture.spec
polygon_offset.spec
README
rescale_normal.spec
subtexture.spec
texture.spec
texture3D.spec
texture_object.spec
vertex_array.spec
visual_info.spec
visual_rating.spec

    D:\extensions\HPspecs\*.*
convolution_border_modes.spec
image_pipeline.txt
image_transform.spec

    D:\extensions\PGIspecs\*.*
misc_hints.spec
vertex_hints.spec

    D:\extensions\registry\*.*
enum_allocation.txt
extensions.reserved
registry

    D:\extensions\rules\*.*
extension_howto.txt
syntax.rules
template

    D:\extensions\SGIspecs\*.*
clipmap.spec*
color_matrix.spec
color_table.spec
depth_texture.spec*
detail_texture.spec
fbconfig.spec
fog_func.spec*
fog_offset.spec*
framezoom.spec*
generate_mipmap.spec
interlace.spec
make_current_read.spec
multisample.spec
pbuffer.spec
pixel_texture.spec
point_parameters.spec*
README
reference_plane.spec*
shadow.spec
sharpen_texture.spec
sprite.spec*
swap_control.spec
tag_sample_buffer.spec*
texture4D.spec
texture_border_clamp.spec
texture_color_table.spec
texture_edge_clamp.spec
texture_env_add.spec*
texture_filter4.spec
texture_lod.spec
texture_scale_bias.spec*
texture_select.spec
video_source.spec
video_sync.spec