The virus detection might be cause by the launcher.exe for file extraction, Hash Changer and File Manipulation code written in it. The Launcher extracts the tool's exe somewhere in the PC with random name, Changes its informations, change its file size and many other things before launching tool. It's a false positive.
As for your question, it basically force the game to activate thermal vision.
It doesn't work for me when I launch the launcher, it oppens a window that says " "Windows cannot find "C:\Users\XYZ". Please verify that you have entered the name correctly, and try again" What do I have to do?