1. Are lw material files from 2018 backwards compatible with v21?
2. Whats the differences between a material files saved as a *.mat file and propin.mat ( dat file, not at my pc atm so I cant remember the file extension )
Fwiw I did a save materials from 2018 of all materials to a file and then tried to load the same materials into v21 and only got some of the materials but not all. As an example Ive got 50 or so matte materials and only 8 eight loaded in v21, yet they're all based on the same settings but different colours.
TCW V21, 2016-2018 PP, Animation Lab V5, TurboPDF V2-V3 & LightWorks Rendering Engine mostly.