[?] Start program as SYSTEM user @ startup

Hi. I am trying to make a "dummy program" that can start any program as system user, but as you see I failed at doing that. I tried to write in to the startup registry path (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Cur rentVersion\Run), but it still wouldn't be started as the system user.

So thats why im asking here: Can someone tell me how I can (Without using psexec.exe or sc.exe) start a program with system rights on startup?

You could inject your program as a DLL inside a program which is started as a system program.

You will fail, if you try to inject a DLL into a system process.
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I wasn't able to try the CallRemoteThread method, because I don't have any idea how to convert a run function into assembly.
And I also wasn't able to try alpines idea, because my C++ editor won't let me do anything without there being any freaking error message popping up.