I think your wife isn't telling you full, Why does this voice changing software need a some kind a ftp-server? Is this software cloud based? Tell me the name of the software? Have you uninstalled this software? Provide information from the windows registry? Or did your wife say that this program has already been removed?
You gave your wife access. After it you lost money. This is the basis for initiating a case. Even if she doesn't understand computers, she caused you damage through negligence. Let her pay you compensation for damages
I don't think the wife knew something about the stolen Bitcoin and I wouldn't blame her. It was the op's fault, he was just careless. I could bet his kids are using the same computer to play games and browse the internet.
Compensation for what? I don't get it, you mean if this were to happened to you, you would get your wife arrested and demand for compensation? You must be a joker. What I know is that, all this would have been avoided if he had stored his Bitcoin offline.