If you’ve seen any Windows Mobile 6.5 screen shots, likely you’d notice support for PNG files in the Window Mobile 6.5 Start screen. Including a nicely rendered PNG file as your application icon’s important to ensure the highest quality user experience across different devices. If you plan to distribute your application via Windows Marketplace for Mobile the requirements document requires that you use a 45 x 45, 60 x 60, or 90 x 90 Start screen icon for your application. For information on creating PNG icons, see Creating Custom Icons for Windows Mobile 6.5. The sample code’ll be referring to in this post can be found here.
Full Article: Windows Blog