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I don't think that you can. The solution that I found was to use the task scheduler to periodically run a Powershell script.
Get-Process -Name notepad | ForEach { $_.PriorityClass = "BelowNormal"} # or use 'Idle'
Set the task to run as the system account and define various triggers like 'logon of any user' or at a specific time every day. You might have to add a Start-Sleep to wait until the exe starts during the user logon process.