Winfoil is an aeronautical computer aided design tool for designing, analysing and modifying model aircraft.
It also provides the ability to print the design (wing ribs, fuselage sides, wing and tail plans) to any Windows supported printer and export design components to DXF files for import into other CAD programs such as AutoCAD.
I don´t see any download link.
Unfortunately, there isn't one available. You may try contacting the developer if you need the software: http://www.ericsson.com/