WinShape Description:

It builds a non-rectangular shape for window from provided bitmap image. You don't need to build the shape consisting of polygons or other graphic primitives - shape will be generated from any bitmap - you have just to show which color should be considered as transparent.
Unlike some other applications it doesn't generate heaps of code for shape construction - it makes just one resource file that must be included to project. You have just to put few lines of code to your application. Resource may be used not only for window shape change but also for any other region operations (clipping/region modifications).
Sample code and application illustrates how to use this resource file.