Exent ActiveX Control – EXENTCTL.OCX
Exentctl.ocx is an ActiveX Control that installs with the Exent Digital Rights Management for Games-in-Demand and AdMuse in-game advertising (some contend that this is adware). The latter can be found in Exent "Free-ride" games. You'll find more information at http://www.exent.com/products_and_services/In_Game_Advertising.asp and at http://www.exent.com/products_and_services/Digital_Distribution.asp. If you remove this file, you may not be able to access the game or other software that installed it.
Possible Adware
Exent Technologies