DWG drawings from AutoCAD Mechanical 2004 DX are not backwards compatible with versions Mechanical 2004 and 6, nor drawings from Mechanical 2005, 2006, 2007, 2008, 2009, 2010 are not downwards compatible. Do not use the automatic default Open/Save settings in the Options dialog (it controls only the DWG file format, not the Mechanical objects in the DWG).
When opening in the 2004 version, the browser tree will be disabled and the drawing could not be saved.
To export drawings to an older DWG format you can use the options "AutoCAD Mechanical XXXX" in the Save As command, or type in directly the command AMSAVEASACADM6, or in the version 2005 AMSAVEASACADM2004DX or AMSAVEASACADM2004, or in the higher versions the commands AMSAVEASACADM2005, AMSAVEASACADM2006, AMSAVEASACADM2007, AMSAVEASACADM2008, AMSAVEASACADM2009.
Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above).
You may also add a link to your web - like this "fan" link:
Featuring: Link your AutoCAD block attributes with Excel tables/sheets. Automatically. Dynamically. Bidirectionally. Try Excellink 2015
Please use these tips at your own risk. CAD Studio (Xanadu) is not responsible for possible problems that may occur as a result of using any of these tips.
CAD Forum - tips, tricks, help, how-tos and FAQ for AutoCAD, LT, Inventor, Revit, Map, Civil 3D, MapGuide, 3ds max and other Autodesk software (support by CAD Studio)