AutoCAD 2005 can read all DWG files back from AutoCAD version 2.5 up to the AutoCAD 2005 format which is a span of 20+ years. AutoCAD 2005 can save back to AutoCAD 2000 DWG format or export to the AutoCAD R12 DXF.
There is also the free Autodesk Batch Drawing Converter so you can batch convert DWG files to AutoCAD R14 DWG using original Autodesk DWG tools.
Cheers,
-Shaan
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