SII File Type

- The quick facts

What are SII files and how to open them

Are you having problems opening a SII file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a SII file?

The SII file format is a configuration file type that uses the .sii file extension, which was developed by SCS Software. These .sii files are generated by the 18 Wheels of Steel: Haulin' software, which is a video game that was also designed by SCS Software for Windows computers. Also known as truck definition files, these .sii files contain truck definition data that is used in this video game.The 18 Wheels of Steel: Haulin' software is a trucking simulation video game for PCs. This program was developed by SCS Software in 2006. When a user stores truck definition settings and configurations, these pieces of information are stored in an SII file that's generated by the video game, and this data is used by this software during the game.It's best to leave these .sii files alone, in order for the 18 Wheels of Steel: Haulin' video game to continue running properly. These may be opened using Notepad among other standard text editing tools, though doing this may display non-human readable data.

How to open SII files

Important: Different programs may use files with the SII file extension for different purposes, so unless you are sure which format your SII file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 10 different SII openers which you will find listed below.

Last updated: December 26, 2019

Suggest another file format using extension SII

While we know of one file format using the .SII file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .SII file.

Various apps that use files with this extension

These apps are known to open certain types of SII files. Remember, different programs may use SII files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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