I don't think you are using the object correctly. I doubt GetSecurityDescriptor("%temp%") is right. Googling to MSDN, I find http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/getsecuritydescriptor_method_in_class_win32_logicalfilesecuritysetting.asp which shows GetSecurityDescriptor(wmiSecurityDescriptor).
Also, the path you have defined in Win32_LogicalFileSecuritySetting.Path is not the same as %temp%.
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