Schuliebug: I don't know how you did your findings, but I used regmon and caught the needed registry setting in under 30 seconds...
code:
4.67996044	explorer.exe:2044	SetValue	HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Start_LargeMFUIcons	SUCCESS	0x1
You just need to set this one to 0 and either force explorer to reload the settings or logoff/logon. For the former, you can check the MSFT site: they'll surely have an easy way to force explorer to reload settings... [Smile]
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Later,   [b]Mad[/b]ruga