It looks like you're looking for a — likely related to Call of Duty: Modern Warfare 2 (2009) multiplayer client modifications (IW4x, alterIWnet, or similar projects).
To be clear upfront: ceg.ece appears to be either a typo or a specific file reference from certain modded/cracked releases (possibly related to CEG — Custom Executable Generation or a bypass for Steam's CEG (Custom Executable Generation) DRM). download iw4mp ceg.ece