: A C# implementation of the original Pascal tool, designed to be more manageable for developers. Trucky's SII Decrypt-TS

SII_Decrypt.exe input_file.sii output_file.sii

Navigate to your game's save directory. On Windows, this is typically located in your documents folder: C:\Users\[Your_Username]\Documents\Euro Truck Simulator 2\profiles\[Profile_ID]\save\[Save_Number] Step 4: Run the Decryptor

If you've ever looked at a Euro Truck Simulator 2 or American Truck Simulator save file and seen nothing but incomprehensible symbols, you've encountered an encrypted SII file. For years, the SCS Software community has been developing tools and sharing knowledge on the official SCS forum to solve this very problem. This comprehensive guide explores everything you need to know about decrypting SII files, the tools available, and how the SCS forum community has shaped this essential aspect of game modding.

This is a common error where the file becomes "half readable, half symbols." This usually indicates a mismatch between the decryption tool version and the game version. As SCS updates their game engine, they occasionally change the encryption algorithm. Ensure you are using the latest fork of the decryption tool.

Recognizing the limitations of a discontinued Pascal tool, the community built modern alternatives with better support:

After editing, place the file in your mod folder with the same relative path (no need to re-encrypt – the game reads plaintext from mods).

If a file fails to decrypt, the forum archive likely contains a post explaining how to fix the specific error code. How to Find It Navigate to the official SCS Software Forum.

“That file is not compiled – it’s already binary from the base game. Try using -base flag or re-extract using latest SCS Extractor.”

Save the file. You do not need to re-encrypt it; the game engine reads decrypted plain text files perfectly fine and will re-encrypt them automatically the next time you save in-game. Best Practices and Safety Tips

Open game.sii with a advanced text editor like . The file will now display clean text lines. You can safely edit values like your in-game money, garage locations, skills, and truck configurations. Save the file when you are finished. Common Use Cases Discussed on the Forum

Go back to your game directory and open the profiles folder.