opening 2006 file in 2005

Is there any compatibility problem opening an Autocad 2006 file with 2005?

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Found the answer afterwards:
3. Has the AutoCAD 2006 drawing file format (DWG) changed from the AutoCAD 2005 file format, as it did between AutoCAD 2002 and AutoCAD 2004? No, the new features and functionality developed in AutoCAD 2006 maintain DWG and DXF file compatibility between the AutoCAD 2004, 2005, and 2006 software versions.
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