You may try to use next dwg fix
Software owns all necessary features: reading, viewing, saving, previewing and even restoring .dwg files
http://www.autocad.fixtoolboxx.com
... with this type of files. [eDrawings][1] has proven ... better manipulate the DWG files.
Install the software ... etc.) and use the File > Open to import ... your DWG files into the application.
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