Biztalk flat file validatation without transform it into XML format

I have a Biztalk 2006R2, which receives some flat files from publisher systems and then transfer these flat files to subscriber systems.

I would like to add the validation on these flat files, without transform it in to XML formatted files. How should I proceed on it?

I have tried using “Flat File disassember”, it can validate the flat file, but at the same time, it will transform the flat file into XML formatted files for further routing, which is NOT our target. Any idea?

Thanks.