72.009 DPI and screenshots using PNG format

Hi all,
This may not be a specific PS question, but has anyone else experienced screenshots which end up as 72.009 DPI when you use the PNG format? I'll take a screenshot using cmd-shift-3 and my Mac will save it as a PNG on my desktop. When I open it up in PS and inspect the image size, it's 72.009 DPI. But when I save screenshots using any other format like jpg, gif, etc. they show as 72 DPI.
Thanks!

Thanks for the correction--PPI and not DPI. For the purposes of taking a screenshot this should be a 1:1 ratio, right? So if I take a screenshot on my Mac it should appear as 72 PPI. What I'm wondering is why doesn't this occur for PNG?
I did do an initial Google search but I wasn't able to find any clear answers. The only thread that caught my attention was over at http://www.realgeek.com/forums/photoshop-cs-72-009-pix-per-inch-problem-383016.html where Chris Cox seemed to address the issue (it looks like it was scraped from the Adobe forums--interesting since I wasn't able to find it initially on here):
Sorry - but there is a limit to the precision of the resolution
specification in PNG (pixels per meter as an integer). You're seeing
the error in the least significant bit of the resolution values.
Other than fixing the PNG spec., I don't think there is much you can do.
So forgive me for simplifying things, but is PNG flawed when using them for screenshots?

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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.
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*SIGH*
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72.009 DPI and screenshots using PNG format

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