LowerLogoVersion is a device setup class property that affects the signature score of a driver package as follows:

  • Windows assigns the best signature score to driver packages that have a WHQL signature for a Windows version that is the same or later than the LowerLogoVersion value.

  • Windows assigns the next best signature score to a driver package that was signed by a third-party using Authenticode technology and to a driver package that has a WHQL signature for a Windows version earlier than the LowerLogoVersion value.

A LowerLogoVersion value is a NULL-terminated string that specifies the Windows version, as indicated in the following table.

Windows version LowerLogoVersion value
Windows 7 6.1
Windows Server 2008 6.1
Windows Vista 6.0
Windows Server 2003 5.2
Windows XP 5.1
Windows 2000 5.0

The system default LowerLogoVersion value for a system-defined device setup class is "5.1." This means that drivers that have a WHQL signature for Windows Server 2003 and Windows XP have the same signature score as a driver that is signed by Microsoft for Windows Vista and later versions of Windows.

For more information about driver package ranking, see How Windows ranks driver packages.