Send Port generates 1 File per minute

Hi

I goggled this through and I think I have to raise it as a new question.

Scenario

I am getting multiple files dropped in a folder , I need to pass them through from one folder to another. The incoming files are flatfiles and the output file name has to be ABC_Datetime. Now when multiple files are dropped , the first file will be passes without issue but rest will get dehydrated as Biztalk says that the file exist. (Which is true for that particular minute)(Error Below)

So If I set the retry interval to 1 (This is the minimum I can set as its Int32 property) one file is moved per minute.

I cannot append %MessageID% to name as the name cannot be more than 32 char.

Any way I can make this work quickly without using orchestration ?

Error

The adapter failed to transmit message going to send port "XXX_Good_FILE" with URL "\\MyLocation\ABC_%datetime%.gff". It will be retransmitted after the retry interval specified for this Send Port. Details:"The FILE send adapter cannot open file \MyLocation\ABC_2013-03-04T135709.gff for writing.
 Details: The file exists.
 ".