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File Formats

The following file formats are used in mods:

  • SSLBIN — compiled logic of the SSL language. The SSL source files are in text format.

  • SSO — object file that contains data in text format, similar to JSON. Examples: level scenarios and data presets.

    SSO files (.sso) describe arbitrary classes, including non-actor entities. Using these files, you can modify the checkpoint system, adjust enemy spawn logic, or edit accessibility settings like the colorblind mode. For example, the clip_settings.sso file lets you configure a weapon's clip behavior, such as its capacity and reload logic.

  • PROP — property component. A .prop file contains data in the same text format as SSO and is paired with code. Examples: Geometry, Health, Ability User, etc. Property can be assigned to the game entity via the corresponding CLS file. For example, CLS file pc_marine_base_authority.cls file contains a Prop Jetpack User (prop_jetpack_user.prop) property which enables marines to use jetpacks.

  • CLS — spawnable actor. A collection of properties is in the same text format as SSO. Example: Bullet, Player, Barrel. By changing the set of properties linked to a CLS file, you can create actors with unique behavior. For example, pc_marine_base_authority.cls is a parent class for all marine characters in the game.

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