BizTalk Pipeline Component Filename manipulation

//Get Filename:
BDO.BankRemittance.Custom.OtherPaymentXmlCreator createXml = new BankRemittance.Custom.OtherPaymentXmlCreator();

//Change Filename:
pInMsg.Context.Promote("ReceivedFileName", "http://schemas.microsoft.com/BizTalk/2003/file-properties", sBatchName + ".xlsx");