I save a lot of coin pictures and use html for my web page as I use complex naming for coin photos. WordPress couldn't keep up with the naming. Not only are you trying to describe the coin but you may have several photos of the same coin: at different angles, lighting or resolution. Thus "Rome_Julius-Nepos_tremissis_both_0600px.jpg" might be a photo and there could be a .txt file of the same name with price & more data in the same directory.