Why BizTalk 2010 can not found the path "C:\Windows\system32\xmlschemas"?

I have put the file named is "domino_7_0_3.dtd" to the below folder, But why BizTalk can not find it in System32\xmlschemas on windows server 2008 R2?

C:\Windows\system32\xmlschemas\domino_7_0_3.dtd

Event Log:

There was a failure executing the receive pipeline: "IAB.Integration.Pol.Pipelines.PartScotWRReceivePipeline, IAB.Integration.Pol.Pipelines, Version=1.0.0.0, Culture=neutral, PublicKeyToken=484fdc2044ba3012" Source: "WRReceivePipeline" Receive Port: "ReceivePort_FILE_IAB" URI: "D:\Test\Receive Port\IAB\Warranty\*.xml" Reason: Could not find a part of the path 'C:\Windows\system32\xmlschemas\domino_7_0_3.dtd'.

in XML message:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE database SYSTEM 'xmlschemas/domino_7_0_3.dtd'>
<database xmlns='http://www.lotus.com/dxl' version='7.0' 

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