[xorcist]

It's not that long ago. GIF certainly predates it. I think ZIP does as well, and probably EPS, just to name a few for scale.

None of these does exactly what PSD does of course, so it's impossible to compare them.

A better example is perhaps TeX, which predates it by far, has been extended a lot during the years, and can still render both original documents as well as modern ones.

[wpietri]

GIF, EPS, and ZIP do the same thing as they did decades ago. PSD does radically different things. Things that were, as I said, completely unpredictable at the time the format was started.