I have the same problem. There is no template for the Aston named xxxwindshieldout and xxxwindshieldin. And there is no way to get the DDS files included into the MAS files that came with the car.
Sorry i should had elaborated. xx is the name main name of the skin so for example if you are painting the IMSA #911 Porsche from 2019 the xx part would be something like 19IMSA911.
Thanks mate. I feel like a idiot! I had the name alt_WINDSHIELDOUT instead off altWINDSHIELDOUT. I would normally pick up on something so basic but this one got away from me. Must be tired..
I had to do this with the new FVRFactor mod. The old "alt_XX_EXWINDOWS" thing you would have used before no longer works with modern textures.