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Trying to import .dwg files in release 13 format - not recognised by SketchUP
nope, need to use an earlier version. 2010 works fine for me. If you don't have ACAD, there is a viewer "TrueView" that you can get from ADesk for free and use it to convert dwg versions.
http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=9078813
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