Oh wow, I totally missed that one. I was spitting around in the gregtechmod.zip....
I don't understand. How is that a problem? If you already have one of them then making something to work the other way is trivial.
Though I'd strongly suggest NOT doing it in windows batch "language". Anything is better than that, even qbasic.
You mean how to handle files that you have not yet created an alternative texture for? Why not just, you know, skip them in the script? It's trivial to see if a file exists or not.
What programming language do you recommend that is simple to pickup, skips missing files and can easily run the script in opposite mode?
Progress on the guide: Got the blocks done. GUI is self-explainatory. Items will be finished today I hope.