PNG File Execution

As You may know, Garkolym found a way to use html code in png files that you can later compile to a .hta file which can again open one command prompt and do some dangerous Actions like downloading viruses,shuting down the pc and much more ,he also already reported it as he says on but you could watch it to if you want.
(he wants probs from mojang otherways hes not reporting it anymore)
Here is the video from Garkolym:
https://www.youtube.com/watch?v=BGC5oUcK5Z0

so the Thing is not only skins work with that method i found out that you can also use texturepacks,maps,recourcepacks and mods so really everything that has something to do with png files as i show on this video:
https://www.youtube.com/watch?v=QSViYXZviww