What is the SII file format?
A file with the .SII extension is a file known as 18 Wheels of Steel truck definition data. It belongs to the Game Files category.
The reliable way to open a .SII file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .SII files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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