Working with Illustrator Files
Fireworks creates all of its graphics as a mixture of vectors and bitmaps. Vector images are created mathematically. Programs such as Macromedia Freehand and Adobe Illustrator produce only vector-based art. On the other hand, bitmap images are created pixel by pixel. The most common bitmap image formats are JPEG and GIF images, used on the Web. Flash works best with vector images but does not mind working with bitmaps. However, you can do some tricks with vector images that you cannot with bitmap image formats.
The default file format that Fireworks produces is PNG. A PNG file can have a mixture of vector and bitmap images.
Adobe Illustrator creates just vector images. An Illustrator file can be imported into Flash. So, does this mean you need to learn another program? No, Fireworks comes to our rescue.
Fireworks does have PNG as its default file format. However, you can export a file from Fireworks in an Illustrator file format. This gives you the benefit of creating an Illustrator file (vector only!) without learning a third tool.