How to export to FBX using PML in pdms 12.1

I am trying to export  FBX or s3d  from pdms using PML

 Navisworks .nwd file export to pmlmac  tell me how to convert to nwd

Paste the complete syntax wrapped in pipes
"C:\Program Files\Autodesk\Navisworks Manage 2015\roamer.exe" -nwd "C:\PDMS\..\?\FileName.nwd" "C:\PDMS\..\?\FileName.RVM"

How export to fbx directly?