arri
Guest
non è gratuito, ma si può usare 15 volte, meglio di nulla, in caso di emergenza 
http://www.anydwg.com/dwf-to-dwg-home.html
http://anydwg.net/download/dwfdwg.exe
-convert dwf to dwg and dxf.
-supports all dwf entity types exported by autocad, including arcs, elliptical arcs, ellipses, true type fonts and etc.
-supports the dwf multi-page specification.
-restores the layers in dwf, renders entire dwf pages.
-extracts embedded images from the dwf file.
-batch conversion ability allows you to convert an unlimited number of dwf files at a time.
-it is a standalone program, autocad not required.
http://www.anydwg.com/dwf-to-dwg-home.html
http://anydwg.net/download/dwfdwg.exe
-convert dwf to dwg and dxf.
-supports all dwf entity types exported by autocad, including arcs, elliptical arcs, ellipses, true type fonts and etc.
-supports the dwf multi-page specification.
-restores the layers in dwf, renders entire dwf pages.
-extracts embedded images from the dwf file.
-batch conversion ability allows you to convert an unlimited number of dwf files at a time.
-it is a standalone program, autocad not required.