John,

Oh, only PNG? I'd thought maybe the W10 version did JPEGs by now.

:-) Even under XP it can handle BMP, TIFF, GIF, JPG (several forms) and,
PNG.

"File Properties" under 7 can edit _one_ PNG attribute, "Date taken".

Less than usefull.

And by the way: GDI+ (which contains the support for EXIF properties) does
not know how to write an EXIF property into a PNG image.

"EXIF Pilot" can; it _could_ be proprietary or a special, but it presents
it under an EXIF tab, _implying_ it's part of some standard.

:-) When you use third-party programs all bets are off. Nothing stops a
program from putting or extracting an EXIF (or any other meta-data
containing) blob into/from one of the earlier mentioned PNG "chunks". Same
goes for other image formats ofcourse

As for "some standard" ? Yeah, I guess so. As long as that means "the
way that I (the program) did it" :-p

Regards,
Rudy Wieser