A trainer runs in the background while the game is active. It interacts with the computer’s Random Access Memory (RAM), specifically targeting the memory addresses where the game stores vital statistics like health, ammunition, and alert levels. By "freezing" or modifying these values, the trainer grants the player abilities that are otherwise impossible or extremely difficult to achieve in standard gameplay.

For a direct piece of software, your best bet is usually a reputable archive or a community-driven site. While I can't run the .exe for you, here are the most common ways players handle v1.01 cheats and trainers today: Recommended Trainer Sources