Thank you xSergio74,
I did not know I could rename the files as you say, so that is quite helpful.
Other good news is that by then opening the model into Leocad, it lets me export to 3D studio max, (Which I am used to, and makes it easier for me to light & render my models.)
Your SR 3D Builder has put the fun back in virtual Lego for me. It did take a day to get it all figured out, but now I am having an enjoyable time.
All the Best, :-)