Sorry, I meant PDMS 3D model using PDMS 12.1SP4.14. I tried to find the format extension but it only says "file" in the properties. In the model there are DESI, CATA, PADD.
but I think the format should be .rvm
There is a product called AVEVA E3D Model Conversion.
It supports AVEVA E3D 1.1, E3D2.1 and 12.1 SP4.27.
It exports 3D geometry and data too.
You should ask your local Aveva Office