KN5 files are encrypted containers used to store game saves, settings, and other data. They are usually created by games using the game's proprietary encryption algorithm. These files are designed to be opaque, making it difficult for users to access or modify their contents directly.

: The resulting files are often messy, with broken naming structures and unaligned meshes that require significant manual work in Blender to fix.

: If you only need to change handling or physics, you may be able to swap the data.acd file with one from a similar unencrypted car, though this often results in the model failing to render if the encryption is "heavily" tied to the data.