2013 can be viewed and or converted back to 2012 single or batch process with a tool from autodesk called True view...its like Bentley view but more powerful and also it too is free and every time new acad comes out a new version of true view follows...Get it and install convert all your 2013 DWGS in one pass to 2012 or earlier and ustn ss2 will read the new DWGS you created...
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