How to save a drawing as dwg with Solidworks API?
check out this help page.
SaveAs2 Method (IModelDocExtension)
              
              
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          If you need more information, please post your macro/api code that you have so far. If you don’t have that, we would need to know a bit more about what you’re looking to do.
As a resource, this may give you a start:
              
              
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