[hulitu]

> you won’t know what codec is actually inside the PNG until you open it.

But this is a feature. Think about all those exploits made possible by this feature. Sincerely, the CIA, the MI-6, the FSB, the Mossad, etc.

[lazide]

The more practical concern is that like AVI you can’t tell if you can read it until you try, which makes it a nightmare especially with codec rot.