Batch convert DWG and DXF files Back and Forth Between R14, 2002, 2004 and 2007 versions of DWG used by AutoCAD.
* Batch convert DWG and DXF files.
* Convert any sub directories.
* Generate same output directory structure as input.
* Abort the converting any time.
* Remember the last operation settings.
* Support AutoCAD 2009.