Any ideas to convert GR2 to BMS or OBJ ?

Hello guys ,, I have some awesome 3d weapons with there ddj files
but the problem is that they are in .GR2 this extension is unknown for me
do anyone know how to convert this to BMS or OBJ ?

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This tool gives me error says : The application requires a Java Runtime Environment
It's already setuped also i reinstalled it then the tool still give me the same error o.O!

BTW i need ur skype if u won't mind i wanna understand something in 3D Programming