Exported image size problem in CS4

Hello,

I have a design in PS CS4 and want to export slices for the web. In the export preview the estimated filesize for the slice is ~200 bytes, however after the export the file size is 4kb.
I have 3-4 small background slices with gradinet and size is 1x200px so the estimated size seems to be ok.
I have alos tried to export in .png and in .gif as well. In all cases the estimation is 200-400 bytes but the result is always ~4kb.

Any idea, what should I check?

Thanks in advance!

I don't understand your problem.

Photoshop doesn't export your slices correctly ?