I understand your point @Kurt_Bremser -- but I don't believe we can change this (and this has been the behavior for years). The communities software hooks into this lightbox "previewer" for common file types based on file extension/mime type and renders in the way most people would expect. GitHub has a similar behavior. You can always get the "raw" data by downloading. Maybe there is a way to make that more obvious in the style -- we can look into that.