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.SII File Extension

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File Type18 Wheels of Steel: Haulin' Truck Definition File

DeveloperSCS Software
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Rare Uncommon Average Common Very Common
CategoryGame Files


This file is saved in a plain text format. You can open and view the contents of this file using a text editor.


Data file used by 18 Wheels of Steel: Haulin', a truck driving game; contains properties for a truck, such as the engine class; saved in a plain text format and often altered for creating custom truck configurations.

More Information

SII files can also contain a list of referenced truck files for the game. For example, the file truck_storage.sii contains the list of truck definition files and can be extended to add new trucks. It is saved in a plaint text format.

Programs that open SII files
Updated 3/1/2011