teknomw3.dll is intended for modders to play genuine copies of Modern Warfare 3, without steam.
It therefor effectively also functions as a crack, allowing people to play non genuine copies of the game.
Because of this, we have decided to not offer this file for download.
Modern Warfare 3 is available for purchase at http://www.callofduty.com/mw3/buy_now and from Steam: http://store.steampowered.com/app/115300/