You don't, that file name was used as an example. In the case of loco's it's more likely to be a file called "Glass_nmc.TgPcDx", which you'd find in the "Textures" folder for that loco.nelson wrote:Where would you find this Window1_nmc file please Dave?
Have you any particular loco in mind here, with that information somebody would be able to tell you exactly which file you need to rename, and exactly where to find it.