HI there. Prior to this I have been using the -force-opengl method. I have been trying to get the 64x to work, but I am hitting a wall. I keep getting error = 193 whenever I try the workaround. Specifically with the mono.dll. I am using the paths suggested by the OP and backed up the files needed from Unity 4.6.4. However, I keep running into an unbootable game.
Any suggestions or tips would be wonderful.
Edit: Windows 7 Enterprise Editions SP1, 64x