How to attach .xls file into request?

I did set those to MTOM/Inline to "TRUE".

Here's log from response:
HTTP/1.1 500 Internal Server Error
Content-Length: 1842
Set-Cookie: ssnid=489d924036f011dd93c7ab376a150aef; path=/;
Content-Type: text/xml



 

 
    SOAP-ENV:Client
    [ISS.0088.9134] Exception occurred while processing the body of the message
    http://dfsap28.kinkosdev.com:7777/ws/am ... amServices
    MTOM Attachments Processing Failed: Cannot de-serialize the input MIME Stream; value of the 'start-info'  parameter  of the 'Content-Type' header of the MIME message is not equal to 'application/soap+xml'
 
 


Here's request:
MIME-Version: 1.0
Host: dfsap77.xxxx.com:7777
Content-Length: 1136
SOAPAction: "amAccountDataServices_services_amServices_Binder_validateBatchFile"
User-Agent: Jakarta Commons-HttpClient/3.0.1
Content-Type: multipart/related; type="application/xop+xml"; start=""; start-info="text/xml"; boundary="----=_Part_4_6999470.1213111352671"

------=_Part_4_6999470.1213111352671
Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
Content-Transfer-Encoding: 8bit
Content-ID:


 

 
     
       
           
              20080610
              qa123
           
            YES
       
     
 

------=_Part_4_6999470.1213111352671
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary

Yes,1,GO Co,GO Co,123 High Street,,Houston,TX,75240,US,J
XXX, Smith,9725551212,xx.smith@go.com,Yes,Yes,Yes,Yes,Yes,Yes,xxx,Smith,xxx.smith@go.com,Yes,Standard,Yes,Yes,456 Main Street,,Houston,TX,75254,US,John,Smith,2145551212

------=_Part_4_6999470.1213111352671--