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There were 2 questions found in this category:
Why am I getting an error -27 when opening a dwg file
Current version of DWG Viewer (1.6.6) supports up to autocad 2009 format. The file being opened is created by later version of auto cad (2010/2011 format). We are currently working on 2010/2011 format. The solution in the meantime is to re-save the file from auto cad as 2009 format.