pro_material_dir and Windchill

Hallo,

Thanks to the new Windchill 10.2 Server I was able to check in a *.mtl file.

But her is my next Problem. How must I type the path at the pro_material_dir parameter in the config.pro to link my material library to the windchill folder?

I try this: pro_material_dir "https://academic.ptc.com/Windchill/Projekt/Formula_2015 - LA ERacing/Ordner/creo_bib/material"

but it didn't work.