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Signature Score (Windows Server 2003, Windows XP, and Windows 2000)

The signature score ranks a driver based on whether a driver is signed. For an unsigned driver, the signature score also ranks a driver based on whether the INF DDInstall section that installs the driver has an .nt platform extension. If the DDInstall section does not have an .nt platform extension, the driver might be for Windows version earlier than Windows 2000.

For an unspecified rank value that is represented by 0xTHHH, the signature score depends only on the value of the two most significant bits of the T field.

The following table lists the valid signature scores:

Signature and platform extensionSignature score

Signed, with or without .nt platform extension

0x0000

Unsigned with .nt platform extension

0x8000

Unsigned without .nt platform extension

0xC000

 

Starting with Windows 2000, a driver is considered signed if it has a WHQL signature. Starting with Windows Server 2003, a driver is considered signed if it has a WHQL signature or an Authenticode signature.

For more information about driver ranking, see How Windows Ranks Drivers (Windows Server 2003, Windows XP, and Windows 2000).

For more information about the .nt extension, see Creating INF Files for Multiple Platforms and Operating Systems.

 

 

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