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WCrihfield
in reply to: FINET_Laurent

Interesting issue.  Have you already checked tried opening each of them in Inventor, then using the DrawingDocument.IsInventorDWG property?  I have never tested it myself before, because we use IDW for all our drawings, so the only DWG's we have are from AutoCAD.

Wesley Crihfield

EESignature

(Not an Autodesk Employee)