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Hi danman03

There could be a few different things going on and either could create such a large difference in file size.

1) The output pixel dimensions are larger than the original pixels dimentions.  I bet you checked this already yet had to mention it.

2) The other that can commonly happen is the the PNG that your are opening is actually a PNG-8 file instead of PNG-24 file which is an indexed file.  It has an embedded color table of the allowed colors in the image (aka indexed) and the the color table can be set to 256 or smaller.    If it were a PNG-8 file with a color table of 64 colors, the file size would be about 1/5 of the PNG-24 file that you likely output from Photoshop.   You can check if the opened file was indexed by looking at the Color Mode in the Image > Mode command.  If it indicates "Indexed" then the read PNG was of the smaller type.

3) Another factor also could be that the image was in 8 bit color and you ouput in 16 bit color which is supported by PNG

So I bet it is one or more of the three items above yet thats just my best guess

Hope this helps

John Wheeler

BTW - If you want to output in PNG-8 you cna do that with the Save for Web approach and select PNG-8 and the color table size.