SilentPatch is a runtime patching system for Grand Theft Auto III, Vice City, and San Andreas that applies bug fixes, stability improvements, and enhancements via DLL injection. The architecture centers around a DirectDraw wrapper (DDraw.dll) that hooks into game processes and loads game-specific patches. Each game has a dedicated module (SilentPatchIII/VC/SA) containing version-specific fixes implemented through pattern scanning and memory hooking. Shared components handle cross-cutting concerns like input, rendering, and configuration. The system reads INI files to toggle features and uses a plugin-like architecture for extensibility (e.g., Special Vehicle Features). It does not alter game files on disk, instead modifying memory addresses at runtime to fix issues like widescreen support, crash bugs, and compatibility problems with other mods.