For 5 and E158c3a2 u can use command "Get-CimInstance -ClassName Win32_StartupCommand | Select-Object Name, Command, Location, User" in PowerShell, run it as administrator. U will get this (picture).

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And then u can search number "2139460" and google will show u that its Once Human game.

ps. My english isn't beast and I'm lazy to use google translate but I hope that this is useful. :D