Resolution of PNG Resets to 72.009

I create or load an image in CS2 9.0.1 at 72 pixels/inch. If I then save this out to PNG format, the resolution is reset to 72.009. Is this a bug in the PNG format or PS?

Normally it probably wouldn't matter but I'm using the images for Windows UI software development and images don't display correctly at non-standard resolutions.

Thanks.
Dan H

If you save to PNG via Save for Web it will strip the resolution data completely, if that's any help...

It is... Thanks, that seems to work.

Dan

Good to hear, Dan