I wanted to save 32bit PNG file with transparency for Android Market (https://market.android.com/apps).
So I made the file in Photoshop – 32bit PNG file.
However, there is no option to export it with 32bit.
Solution
Import to Firewalks.
In Fireworks, choose “Window” > “Optimize”, change the export file format to PNG 32, and set “Matte” to transparent.
Select File > Export.
Select Images Only from the Save As Type pop-up menu.
Name and save the file.