Here is a link to where you can download the Autodesk FBX converter. It will let you convert OBJ, DXF, DAE, and 3DS to FBX.... FBX Converter 2013.3 Download
Here is a link to the page where Autodesk FBX software tools are listed... Autodesk FBX Software
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Here is a link to the page where Autodesk FBX software tools are listed... Autodesk FBX Software
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 I ran into a pretty big brick wall with Unity's model importers, so hopefully this one will help.
	
	
 @MicheusVieira   
 @MicheusVieira   
 Micheuss   
 micheus4wings3d