About the conversion to ldraw format, there is a program called AD3D which can open and save ldraw files and a lot of other 3D formats, so you could convert between formats with it. In addition, the program is very easy to work with, very intuitive. The problem is that it´s not freeware, but shareware. Anyway, it woths to take a look a it:
http://www.inivis.com/
http://www.inivis.com/