Not getting the correct part of the rosettanet message?

I am receiving a message from webMethods that is sending the data as a 
multipart mime message.  I have configured my ****ts so that I drop the 
message into a directory (using a FILE send ****t) any time I receive a 
message.

When a message comes in, I am seeing a new file generated in my drop 
directory, but when I look at the content of that file, it is the wrong 
part of the message.  It is saving the "RNSubType=service-header" 
instead of the "RNSubType=service-content" ****tion of the message in my 
drop file...  How can I instruct the system to store the service-content 
instead?

Here's a sample of what the file coming in looks like...  I've snipped 
out large (but irrelevant) ****tions of the message.

-mdb

MIME-Version: 1.0
Content-Type: multipart/related; type="Application/x-RosettaNet"; 
	boundary="----=_Part_43946_1326206367.1174601898965"
Content-Description: This is the RosettaNet business message

------=_Part_43946_1326206367.1174601898965
Content-Type: Application/XML; RNSubType="preamble-header"
Content-Description: This is the Preamble Header part of the business
 message

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Preamble SYSTEM "PreamblePartMessageGuideline.dtd">
<Preamble>
   <DateTimeStamp>20070322T221817.380Z</DateTimeStamp>
   <GlobalAdministeringAuthorityCode>RosettaNet
</GlobalAdministeringAuthorityCode>
   <GlobalUsageCode>Test</GlobalUsageCode>
   <VersionIdentifier>1.1</VersionIdentifier>
</Preamble>

------=_Part_43946_1326206367.1174601898965
Content-Type: Application/XML; RNSubType="service-header"
Content-Description: This is the Service Header part of the business 
message

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE ServiceHeader SYSTEM "ServiceHeaderPartMessageGuideline.dtd">
<ServiceHeader>
   <ProcessControl>
    	[snip!!!]
   </ProcessControl>
</ServiceHeader>

------=_Part_43946_1326206367.1174601898965
Content-Type: Application/XML; RNSubType="service-content"
Content-Description: This is the Service Content part of the business
 message

<?xml version="1.0"?>
<Pip2A1ProductCatalogInformationNotification>
	<fromRole>
    	    	[snip!!!]