Inside was a single screenshot. A decompiled DLL from the patch. Hidden in the code, a string of text the official developers had left behind, never activated:
TDU2 AutoPack 20 is a popular modification pack for the racing game Test Drive Unlimited 2 (TDU2). The pack is designed to automate the process of creating and managing cars in the game, making it easier for players to add new vehicles to their collection. tdu2 autopack 20