🎮 Game Formats

Warning

Formats specifications are based on reverse-engineering efforts and may contain inaccuracies. Subject to change.

🧊 Model Formats

.mcsa	Scene Assets (MCSA.bt) Configuration: Flags, Scales. Geometry: Name, Material, Vertex Position, UVs, Normals, Polygons. Optional: Skeleton bones, Animation clips.
.mcsb	Scene Bundle (MCSA.bt) Identical to .mcsa but with integrity check. Contains leading hash to prevent tampering.
.mcvd	Vector Dynamic (MCSA.bt) Simplified low-poly geometry. Includes animation data. Used for physics/collision trace detection.
.mcal	Animation Library (MCAL.bt) Metadata: frame count, bone count. Technical skeletal animation transforms (per bone). Model-specific (requires matching skeleton).
.mcws	World Slice (AES Encrypted) Slices of safezone (world as 3D model). Used in safezone workbench rendering.

🧱 Texture Formats

.ol Object Layer (OL.bt)

Standard .dds (DirectDraw Surface).

Has simplified structure and mipmaps are compressed using LZ4.

Some normal maps textures can be inverted.

Some textures can be cube maps. (OLCUBEMAP.bt)

Mainly located in: gloomycore/sky, effects/textures, stalker/gui.

Texture Suffix Conventions

Suffix	Map	Type	Purpose
_diff	Diffuse	Base Color / Albedo	Contains raw surface color without lighting or reflections.
_spek	Specular	Reflectivity Control	Defines intensity and sharpness of highlights/reflections.
_nrm	Normal	Surface Detail	Simulates small bumps/dents without changing geometry.
_emi	Emission	Self-Illumination	Makes parts glow or emit light independently.

.mic Media Image Container

Standard .png (Portable Network Graphics).

Has modified file signature.

Previously used for game GUI.

.texarr TEXture ARRay (TEXARR.bt)

Container for .dds (DirectDraw Surface) textures.

Textures referenced as group:path (e.g., probuilder:general/generic).

🗂️ Other Formats

.xeon eXtended Encrypted Object Notation

Contains large JSON structure. AES Encrypted.

Once encrypted individually .eon files combined into bundles.

🛠️ Launcher Formats

.map MAPping hashes (HASHMAP.bt)

Contains SHA-1 hash mappings for game files.

Used by launcher for integrity verification.

.torrent.bin TORRENT BINary (TORRENT.bt)

Modified .torrent (Torrent) file.

Used by game launcher for content delivery.

Trackers block unauthorized access (token required).

🗃️ NBT Formats

Uncompressed NBT (Named Binary Tag) format and can be viewed/edited with tools like NBT Explorer. Can be raw, but in game uses GZIP or ZSTD compression.

Assets

Filename	Compression	Purpose
stalker/itemnames.dat	GZIP	Quests items descriptions.

Configs

Filename	Compression	Purpose	Keys (examples)
prefs	ZSTD	UI read state cache. Tracks seen articles, experiences, tutorial prompts, and ads.	seenArticleLinks[], seenExperiences[], hasSeen*

Per-Character Configs

Located in /config/%CharacterName%/.

Files prefixed with sd (Synced Data) contain synchronized player state cached locally.

Filename	Compression	Purpose	Keys (examples)
common	ZSTD	General settings and UI states. Loot filter (“trashed” items), Reports cooldown, Events UI toggles, Viewed tutorials and introductions.	trashedItems[], caseLastOpenCount[], complaintsData{reportedCharnames[], reportedHacks[], ...}, seenFrontlineIntros
sd0	ZSTD	Incoming friend requests. Contains a list of pending requests for UI.	requests[]
sd1	ZSTD	Recent interactions (last 200 players). Stores usernames, faction IDs, and interaction type for the “Recently Interacted” UI.	interacts[{allianceId, type, username}]
sd2	ZSTD	Notifications history (last 100 popups). Stores message content, read status, and dynamic payload (varies by notification type).	notifications[{isRead, receivedMoment, notification{channel_id, payload}}]
sd3	ZSTD	Store (donate shop) view history. Tracks observed shop offers.	observedOffers[]
sd4	ZSTD	Profile customization UI state. Tracks last seen versions of backgrounds, patterns, stickers, and tags.	lastSeenBackgroundsVersion, lastSeenPatternsVersion, lastSeenStickersVersion, lastSeenTagsVersion

⚙️ Config Formats

Filename	Format	Purpose
display	Text	Selected display ID
keybindings	JSON	Keyboard control mappings
options.json	JSON	Game settings (graphics, audio, gameplay)
quests.json	JSON	Quest visibility toggles
waypoints.cfg	JSON	Custom map markers