Output Options -- Overwrite existing files

I OCR multiple files from different locations routinely and need a better method to identify what files have previously been OCR'd.  My question has to do with the Output Options of the OCR multiple files function of Adobe 9.  It would seem to me that if I add "ocr" to the filename and check the overwrite existing files option that I would not end up with 2 files -- the original file and the OCR'd file with "ocr" added to the filename, but that is what happens.  Am I  doing something wrong or am I misinterpreting that function.

Regards,

Steve