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If you encounter this problem, please follow steps provided below:

Diagnosis 1: You might not have vdraw convertor properly installed

1. Download VC++ 2008 SP1.

2. Uninstall old vector draw converter file (if it exists).

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3. Install the latest one, please download it from here.

Diagnosis 2: that particular DWG file is corrupted. Other DWG file no problem.

You may want to save it in DXF or older version of DWG to work around the problem.

Diagnosis 3: The machine just won’t open any DWG file no matter what

If all else fails, just save it in DXF file and you should be able to open.