When you say there are no resources, are you speaking of just the .RC file, or do you mean there are no .ICO/.BMP 's, etc, anywhere in the project?

Is there currently a custom icon being used, or is it using the default application icon? If a custom icon is being used, you might start by searching the project (in the source code) for the filename of that icon.

It is hard to get much out of the code snippet you posted, as there are many user defined variables and functions. I think I would start by looking into that "run" function.

Try searching for any calls to RegisterClass/RegisterClassEx, and look for where the WNDCLASS/WNDCLASSEX structure is filled in, and see what is used for the HICON member. You might also try searching for any calls to LoadIcon or LoadImage, etc.