Plutonium

I want to extract gun models like the m1911 from zombies but I can't use Lime or Wraith Archon to extract it.
I think what happens is the programs are not detecting the game because it's not called t6zm.exe, but if I change the name and try to launch it, it won't...
So basically, any fix for the programs to detect the game, or any way to rename the .exe file name and being able to launch it?