The game is pure .net ... no game engine used. The only external dlls I use are from the FMOD sound system. I will investigate this. None of my testers had this problem.
Thanks for your effort.
Does windows defender tell which file has the problem?
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Thanks for your help. Unfortunately I was not able to find a solution. I have send the files to Microsoft and they say everything is fine. The rule"Trojan:Win32/Fuerboos.A!cl" is not an actual virus but a heuristc rule. Maybe this rules change frequently ... so that neither me nor MS can reproduce your finding... :(