MACROMEDIA STUDIO 8-EXPLORING STUDIO 8 Manual page 214

The JPEG image opens in Fireworks. Because JPEG images are bitmaps, all
your objects and layers are flattened in the Layers panel.
Also, the Property inspector displays only a few properties. All the
properties available in the PNG file are no longer available in a JPEG file.
You still have your source PNG file, so if you need to do more work on the
design, you can edit the PNG file and export it again. A PNG file always
remains fully editable even if you export the image to another format, such
as JPEG.
In this tutorial, you accomplished the work required to create a banner
graphic in Fireworks. You learned how to create a new document and
import images. You also worked with layers, shapes, masks, and text.
Finally, you optimized and exported the completed image.
For detailed information about any of the features covered in this tutorial,
and for information on additional Fireworks features, see Using Fireworks.
214 Tutorial: Creating a Page Banner