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GT1 Disc Filetype Index

Reference docs for the archive/.DAT filetypes found on the Gran Turismo 1 disc, as extracted by GTExplorer. Each page lists that archive's real folder/file structure; long, repetitive runs (sequential numbers, paired model/texture sets) are collapsed into ranges or tables so the full contents stay scannable.

Filetypes

Archive Files Description
ARCADE.DAT 68 Texture set for the Arcade mode UI — car-select icons, screen backgrounds, and similar front-end art, stored as sequentially numbered .tim images. The final entry (067.seq) is an animation/sequence script rather than an image.
ARCADE2.DAT 8 A small supplementary Arcade-mode archive: a few extra .tim images plus one .car/.tex model pair.
BG.DAT 20 Track background environments (skyboxes). .tpk files are texture packs that skin the sky dome/backdrop, and .sky files describe how those textures are placed and animated. 018.bin is an unclassified raw entry.
CAR.DAT 1353 The full car garage — every drivable car in the game, stored as a .car 3D model plus a matching .tex (GT-CTEX) texture. Most cars also have a _night variant with different, headlight-lit textures for night races. manifest.txt is GTExplorer's own generated index, not a game asset.
CARCADE.DAT 80 Cars available in Arcade mode, stored the same way as CAR.DAT (.car model + .tex texture) but addressed by numeric index rather than name, since Arcade mode only needs a fixed, small roster.
CARINF.DAT — Car information database (compressed GT-ARC): SPEC records, part tables (brake, gear, suspension, …), string tables for makers/models/grades. Used by the Car Database editor in GTExplorer.
COURSE.DAT 9088 Every racetrack in the game. Each course has a .dat (layout/logic) and .ps (polygon/collision mesh) file at the top level, plus a matching _tims/ folder holding all the scenery, signage, and road-texture .tim images used to render that circuit.
GAMEMENU.DAT 15 .tim images for the main front-end menu screens (title, mode select, etc.).
MENU/MENU_HTM.ARC 36 GT-mode menu page scripts (GTHTML). Each file is a small binary hotspot layout: background TIM name, clickable rectangles, links to other pages or engine actions (LIST_GARAGE, SHOW_SPEC, …). Names from MENU/HTMLS.IDX. See GTHTML format notes.
MENU/MENU_IMG.ARC 41 TIM backgrounds for the GT-mode shell pages above (home, garage, gtf, toyota, trd, …). Named by MENU/IMAGES.IDX. Companion to MENU_HTM.ARC, not the large root MENU_IMG.ARC.
MENU/MENU_SND.ARC — Menu sound bank for the GT-mode shell; indexed by MENU/SOUNDS.IDX (gt.ins, gt.seq).
MENU_IMG.ARC 6 nested × ~1043 Root bulk menu-image container (~121 MB). One uncompressed outer GT-ARC holding six nested language packs (~19–21 MB each). Each nested ARC is compressed and contains on the order of 1043 files (mainly TIMs for dealers, licence centre, and the full in-game menu set).
MENU_RAW.ARC 6 Companion to root MENU_IMG.ARC: large filename lists (~1043 .htm names, ~1043 image/sound names, 14 .seq names), used-car listing data, and nested support ARCs.
PITMENU.DAT 24 .tim images for the pit-stop / garage menu screens.
REPLAY.DAT 1 Almost empty — a single REPLAY/ folder containing one file, REPLAY.DAT. This looks like a placeholder slot the game writes replay data into at runtime rather than a populated asset archive.
SOUND.DAT 4076 The game's audio bank. Top-level .ins (VAB instrument headers) and .es (engine/event sound definitions) files drive the sound engine, while 249 numbered _samples/ folders each hold one sound bank's raw waveform data as paired .adpcm (PlayStation ADPCM audio) and .wav files.

Self-contained GT Home / map / garage / Toyota / TRD shell:

File Role
HTMLS.IDX Ordered list of 36 .htm page names
MENU_HTM.ARC GTHTML page scripts
IMAGES.IDX Ordered list of 40 .tim names
MENU_IMG.ARC Page background TIMs
SOUNDS.IDX gt.ins / gt.seq
MENU_SND.ARC Menu sounds

Background TIM for a page is resolved by basename (e.g. home.htm ↔ HOME.tim / home.tim).

Format glossary

Quick reference for extensions used across these archives:

Extension Meaning
.adpcm PlayStation ADPCM — compressed audio sample.
.arc GT-ARC container (may be nested).
.bin Unclassified/raw binary blob.
.car 3D car model/mesh (GT-CAR).
.dat Course layout / game logic data, or generic archive.
.es Engine/event sound definition.
.htm GTHTML menu page script (@(#)GTHTML) — not web HTML. Hotspots, TIM name, links/actions.
.idx Index file listing names for a sibling .ARC (e.g. HTMLS.IDX, IMAGES.IDX).
.ins VAB instrument header (sound engine patch data).
.ps Course polygon or collision mesh data.
.seq Animation or playback sequence script.
.sky Skybox placement/animation data.
.tex / GT-CTEX Car colour/texture package (palettes + 4bpp image), paired with .car.
.tim PlayStation TIM — PS1 image/texture format.
.tpk Texture pack (grouped set of textures), used for skyboxes here.
.txt Plain-text index or manifest (GTExplorer metadata, not a game asset).
.usedcar Used-car dealership listing data.
.wav Uncompressed PCM audio sample.

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