I can't open ffCompiler

[Fouras68]

Hey ! i recently try to look up the code of different mission of mw2 and modify them like make us army ennemy to the player etc and i found ffCompiler who was exellent for what i was wanting but i can't open it it say " Possible Tampering Detected. This Software is encrypted to provide copy protection. Certain virus scanning programs may prevent the software from starting du to their heuristic analysis."

The thing is that i white-list ffCompiler to my Anti-Virus but i keep having this message :/