The "IGI 2 Covert Strike Trainer v 1.3" falls into this category. It does not alter the game's installation files permanently; rather, it actively monitors the game's data while you play, forcing certain values (like your health or ammo count) to remain at maximum or altering game logic (like disabling alarms).
Typically distributed as a single IGI2_Trainer.exe file (often flagged by antivirus as a false positive due to its memory-modifying behavior), it injects hotkeys that give you god-like control over David Jones’s one-man war. igi 2 covert strike trainer v 1.3
Some versions of the trainer include a "Give All Weapons" hotkey, which spawns every gun in the game (including the elusive Minigun and the OICW) into your inventory at the start of any mission. The "IGI 2 Covert Strike Trainer v 1