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1/
CTRL-R, 
shell:startup for currently logged user
shell:common startup for all users

2/ Registry
https://msdn.microsoft.com/fr-fr/library/windows/desktop/aa376977(v=vs.85).aspx

3/ Service
https://www.howtogeek.com/50786/using-srvstart-to-run-any-application-as-a-windows-service/