._ file error

When I drop a ps file from the Mac, Distiller is processing two files … the first file errors out, it has the same name as the rest of the file except it start with a '._'

ex: ._PD_05-10_A001.ps

This file creates an error log file, then distiller moves on and process the actual PD_05-10_A001 file … that part seems to be working properly.

Do you think there's a way to avoid the ._ file?

Thanks