SCS Software has never officially endorsed unlockers. Their modding guidelines state that mods remain the property of their creators. However, SCS rarely enforces this unless a mod uses stolen licensed brands (e.g., a real Mercedes logo) without permission.
Before diving into the tool, it’s essential to understand the file it acts upon. A file with the extension is the container for all mods in ETS2 and its sister game, American Truck Simulator (ATS). Functionally, it is very similar to a .zip or .rar archive, acting as a package that holds all the resources for a mod.
It's important to distinguish the SCS Unlocker from official tools.