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This wiki contains some (unofficial) documentation for the binary map format of ETS2 and ATS, using the output of the editor console command edit_save_text as a guideline.

Nothing in this wiki is guaranteed to be 100% accurate; I'm just piecing things together as I go.

Updated for map format version 900 (game version 1.48.5/1.49).

.mbd

The root of a map is the .mbd file (mapname).mbd. It defines various global settings such as the scale of the map.

Sectors

The content of a map is divided into a grid of individual sectors with a size of 4000×4000 units (1 unit = 1 meter). They are stored in a subdirectory with the same name as the .mbd file.

Each sector consists of four to six files:

• the .base, .aux and .snd files, which contain the items and nodes of the sector. The structure of all three files is identical; the only difference is which item types they contain.
• the .data file, which contains the cosmetic stuff for Road and Prefab items specifically.
• the .desc file, which describes the sector itself.
• the .layer file, which stores editor layers.

The .snd and .layer files are optional.

Data types

Strings in this format are UTF8 Pascal strings with a uint64 length prefix (you know, in case someone needs a sign with more than four billion characters on it one day).

A token is an 8-byte type which encodes a string of up to 12 characters from a limited character set. It's used as an identifier throughout the Prism engine.

The other data types should be self-explanatory.