Exporting an image map flattens the images in the file so they are no longer editable. If you didn't save a copy of your original file as an editable Fireworks PNG, you are out of luck and will need to recreate it. :-( You need to do your updating in the orignal, editable PNG file, and then re-export it to your Dreamweaver site.
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It's somewhat confusing, but a Fireworks .png has extended information in the file that a regular .png file does not. When you save a .png file, you get a Fireworks document. When you export (from File>Export or File>Image Preview), you get a flattened .png bitmap file that does not contain all the wonderful extra information that makes a Fireworks document so special.
Because the extensions are identical, it can be easy to overwrite your Fireworks document with a flattened bitmap if you accidentally export to a file of the same name. I read a tip on this forum once: someone suggested naming Fireworks documents with a pseudo-extension .fw.png (really, the .fw is part of the name). It won't prevent accidents, but it will help to remind you of which files are which.
Remember: save your working documents, export flattened output for the Web. I'm sorry if you've lost your work, though.
Thanks to you both.
I think I understand what's happened, and yes, I've overwritten my original PNG
sigh. Fireworks doesn't really make this obvious!
That renaming tip is great! We already have a process for making PNGs of marked-up PDFs (so the extension is .pdf.png), so this will fit in just nicely!
You both ROCK!