This is a small application to convert glb to obj
extract the zip file anywhere. launch glb2obj.exe file, choose one or multiple files ,then an output folder and press "Convert Files".
to import objs into 3dsmax you should use my script "ImportObj" http://www.scriptspot.com/3ds-max/scripts/importobj ,It will import PBR materials and handle multiple parts objects.
Update 1.1: Added glTF support,a better texture file naming for PBR textures,and a new UI.