>>117816
Paint in Vista is basically the same one used since Win2k (so, .png support at all) with a handful of really minor changes (the default palette is different IIRC). 7 onward Paint is basically a completely different program.
As a result, Paint on Vista doesn't do a lot of things that more modern programs do and uses the old file selector.

Also, turn off indexing on the drive to make search not suck. I have to do this even on 7/8/10. It's slower, but it actually finds things.