Don't let "RunOnce" mislead you. You stuff RunOnce on every logon, so it runs after every logon. The idea is that if you remove it from KiX, then it's gone from the reg as well. You could alternative put it in the "Run" key but then if you remove it from the script, it's still in the reg.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.