I believe you did not understand what I meant. I'm here asking if there might be some way for other players not to convert the images. And yes, I know very well that it is possible to convert an image and that at the moment there is something that prevents this from happening, but could have. Thanks for the reply.
There should be a way for the skins being converted to dds into the X folder, to have a size less than 100x100. So other players would not have access to private skins, not being able to convert them to jpg.