Problem with screenshots--PNG displays at 72.009 DPI

Hi, I thought this might be the most appropriate forum... plesae move if it's not.
I've noticed that when I take screenshots that are saved as PNGs, they display in Photoshop as 72.009 DPI. But when I save as GIFs, JPGs, etc., they display as 72 DPI.
Why do screenshots saved as PNGs add this extra information?

*SIGH*
Listen, I know it's great to jump on the new guy cuz he appears here out of nowhere complaining etc... but listen:
I've been using Flash for over 10 years. Longer for Photoshop. I am intimately acquainted with optimizing techniques in Flash in conjunction with Photoshop. I'm behind by 1 version in Flash, so yeah, maybe I should explore the PSD importing a little more. However I need to make this point:
- Flash strips out the extra info you speak of, so it's irrelevant. Workflow is what matters and this "bug" (if we can agree to disagree on calling it a bug or not) interrupts what used to be a very fast workflow: Edit, CTRL-S, done
- Photoshop did not introduce "72.009" until (if memory serves correctly) version CS2 or maybe CS1. Prior to this it kept PNG's dpi to 72. I reported the problem back when I figured it out in CS2. Nothing changed.
- Actually, in the interest of being fair, Flash for many versions would display PNGs that had 72.009 correctly and then starting with Flash 9 it would display PNGs at the 1 pixel less sizing I mentioned above (ie: 299px instead of 300px)
- There is no practical reason for 72.009 regardless of it being a translation of inches to pixels. Pixels and screen resolutions use integers. That's the bottom line, and PNG is a web format, not a print format.
So, this is one of those situations where the buck can be passed from Photoshop to Flash and Flash to Photoshop for all eternity, as seems to be the case. But let me ask, is there any practical or rational reason for PNGs to keep automatically defaulting to 72.009 ? And if so, then why not also apply this logic to GIF, JPG, etc?
I'll go make noise in the Flash forum.
Bye

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