John,

I hadn't realised these were editable! The edit boxes don't appear until
you hover over them!

So much for GUI "improvements" I guess. :-)

Do you see a comment field for a .png file under XP?

Under XP the dialog itself doesn't change, it just grays out all fields that
it doesn't retrieve from the file. In the case of an PNG /all/ the fields
are grayed-out.

In other words, XP fully ignores the existance of those iTXt, tEXt, and
zTXt "chunks".

Regards,
Rudy Wieser