Creating 32bpp BMP file for toolbar image strip?

I've got a 16 pixel high image that I've created in Paint.NET that I'd like to use in a Visual Studio toolbar.

My image is a .PDN file with multiple layers. Visual Studio requires a 32bpp BMP file. How do I convert the .PDN file to the correct format .BMP file?

I'm not looking to have this happen in my program.

I'm cool with having to do something manually whenever a change is made to the .PDN file, although I'd prefer something I can integrate with my automated build.

I've tried using the BmpX extension to Paint.NET, but it saves the background as white, rather than transp开发者_JAVA百科arent. I've tried using ImageMagick's convert utility, but something's wrong with the saved BMP file, and VS displays it slightly corrupted and offset to the right by a couple of pixels.

Note: I'm using convert.exe by saving from Paint.NET as a .PNG file and then using convert strip.png strip.bmp. The transparency's correct, though.

It turns out that VS2010 can cope with .PNG files.