THis seems to be a commandline tool that converts dxf to 3ds:
http://www.bbs.motion-bg.com/index.php?file=46
although the readme says it can handle dxf only to Autodesk Version 13 release dxf standard.
http://www.bbs.motion-bg.com/index.php?file=46
although the readme says it can handle dxf only to Autodesk Version 13 release dxf standard.