A DLL (Dynamic Link Library) is a module of code shared by multiple programs. Games like Far Cry 5 ship dozens of DLLs for rendering, input, audio, anti-cheat, and platform integration. When the executable expects fc-m64.dll and it’s not present or fails to load, the program cannot complete its initialization. The result is immediate and blunt: the game won’t start, accompanied by an error message that reduces a complex runtime dependency to a single, alarming line.