baseq3 pk3 structure example 1:

env/mapfilename/...tga
levelshots/mapfilename.tga
maps/mapfilename.bsp
scripts/mapfilename.arena
scripts/mapfilename.shader
sounds/mapfilename/....wav
textures/mapfilename/...tga
textures/mapfilename/...jpg
readme.txt


baseq3 pk3 structure example 2:

env/mapfilename/sky_bk.jpg
env/mapfilename/sky_dn.jpg
env/mapfilename/sky_ft.jpg
env/mapfilename/sky_lf.jpg
env/mapfilename/sky_rt.jpg
env/mapfilename/sky_up.jpg
levelshots/mapfilename.jpg
maps/mapfilename.bsp
maps/mapfilename.aas
scripts/mapfilename.arena
scripts/mapfilename.shader
sounds/mapfilename/blub.wav
textures/mapfilename/wall.tga
textures/mapfilename/ground.jpg
mapfilename.txt


Defrag pk3 structure example:

levelshots/mapfilename.jpg
maps/mapfilename.bsp
scripts/mapfilename.defi
scripts/mapfilename.shader
sounds/mapfilename/go.wav
textures/mapfilename/roof.tga
textures/mapfilename/pad.jpg
mapfilename.txt