git clone --branch main --depth 1 https://github.com/allogic/Nippon
Setup.ps1

AFD - unknown purpose but are small and contain no multimedia.
AFS - if an AFS file is a subfile than it only contains audio, usually a few. Game Extractor can extract these but if you have try after you exact the big one (if some one can optimize the script then this should be displayed as a folder)
BIN - These are sub archives that Game Extractor can't really extract properly. The format is easy the first 4bytes are the number of files. then the next 4 bytes are all of the file offsets, then there are text extensions (4bytea for all of the files possible extensions include:
ANS - These are blank 16bytes strange
AKT - Contain Collision Maps and Terrain type Maps (ie is is dirt, water mud ect)
BMH - Contain mostly floats possibly level terrain related contain the header BMH
CAM - Unknown purpose contain the header mtb3 (in lowercase)
CCH - Contain mostly floats probably map related no real header
DRH - Related or identical to the SCH files, no real header mostly floats
EFF - are similar or identical to the BIN archives
FI2 - These contain object placement data
ITS - Contain no floats possibly map related no real header
LI3 - Contain some floats unknown purpose
MEH - Are small contain mostly floats have the header MEH
MOT - Unknown Contain the header mtb3 (in lowercase)
MSD - which is itself a sub-sub file archive. It contains no header and begins with the relative positions of the files it contains. Maybe it is collision map data, but it does not use floats
MSA - Contains no header other than the size of the whole file, no floats maybe texture meta data
MST - really small no header no file size no floats ect
RNI - These are small, Unknown purpose no real header
SCH - These contain mostly Floats probably related to map boundary lines-contain no real header
SCR - These contain the Header scr (in lowercase) these are model archives for level terrain that use 16bytesigned vertexes similar to MD archives that contain character meshes
SEQ - Probably animation data
T32 - These are some sort of Tim2 textures but DO NOT contain the text header TIM2
T3L - same as BIN archive
TM2 - These are regular Tim2 textures that DO contain the standard TIM2 text header
TRE - Unknown related to TSC contain no real header
TS  - Possibly related to camera movement these contain the header TS
TSC - Unknown releated to TSC contain no real header
TST - Same as the BIN archive
BMT - These are small files unknown purpose
D   - The ones on the demo are archives that only contain 1 of each of the following
MPD - contain Meta data for the textures no real header
DAT - similar to BIN archives contain many files and models:
MD  - Contain the Header scr (in lowercase) + five 00 bytes+ the number of models (4bytes)+ four 00 bytes + The offsets to the models
MDB - These are the models packages and contain the submeshes+yet another type of Tim2 textures
DIR - a small text file with the name of the path to the video files
S   - some type of audio or video adx format??? this file might be the promational video for the full version of okami
SES - Audio
SFD - Audio
TBL - (map.tbl) This looks like a source code map, or at least ALL of the functions in the ELF file (PS2 Excutable file) this could easily be into hacks, but the file might not be included in the full version of the game
TM2 - (moji8.tm2) a Tim2 texture of the letters used in for menus and character speech.