Huge file size with Save for Web but preview is ok

Hi,
I have googled but not found anything about this but I have the same problem on my computer and also on a colleagues computer so it seems it should not be totally unknown.
This is what i do
1 Open a eps file, one color logo, 72dpi, size it to 110x21
2 save for web
3 select png-24 format. preview says file size ~1.3 kB
4 save -> actual file size on disk is 4 kB (ie 3 times bigger file size than it should be)
5 Preview and then right click in browser + save image as gives correct file size (on my colleagues computer this does not work, he always gets the wrong size)
I have also tried with gif and various settings, image sizes etc and the result is the same.
I'm using Windows Vista 32-bit and Photoshop CS4.
Is this a known problem?
Thanks

Thanks for your reply but i don't think that's it. When I check properties on the file in Windows it tells both "Size" and "Size on disk", where the latter is actual size on disk (depending on cluster size) but the size I am talking about is the first one.
Also just to be clear, when I say Preview, I mean clicking the Preview button that opens the file in a browser window. Not the preview within the Save for Web and Devices dialog. So I think this file is correctly created and *should* be the same as if I click Save (but it obviously isn't)
This sounds very much like a bug to me, anyone else who have seen this or can recreate?
Thanks

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