Thank you to anyone who has already donated - your generous donations helped make three months of treatment possible.

My brother Nate continues to fight stage IV Hodgkin's lymphoma. He's just 31, with a wife and baby girl. They have no active income (since he's been unable to return to work), no insurance, and cannot afford the treatment he needs. Nate and his family need your help. Please consider a donation, every dollar helps. Thanks.

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using AcadApp = Autodesk.AutoCAD.ApplicationServices.Application;

//open .dxf file
AcadApp.DocumentManager.Open("somefile.dxf", false);

//do some actions

//need to save as .dwg 2004
var doc = AcadApp.DocumentManager.MdiActiveDocument;
doc.Database.SaveAs("file.dwg", DwgVersion.Ac1800);


/*
The problem is that after opening saved file Autocad 2012 (version 18.2) says that some errors've
been found and offer to recover file. After that everything is OK. If I save as DwgVersion.Current 
or DwgVersion.Newest everything is Ok too.
*/