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Opening autocad files with COM interop

1
Hi all
I can't open some .dwg files with COM interop. When these files aren't created with an official autodesk program, for example with Draftsight, it is generating a COM exception. It is possible to open the file directly with Autocad, it shows me a message saying that is not created by an official autodesk program, but it is possible to open.
Any clue?
Thanks.
Sep 25 '13 #1
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