提取文件的图标/缩略图

I want to extract the Icon/Thumbnail (different size) of a file from windows shell on my project. I am able to extract the thumbnail with out any issue, but the problem came when working with files that don't have thumbnail view. The issue is I am not able to get the bitmap as the windows explorer shows. I am getting a black color where explorer is showing a nice gray shadow.I want to extract the Icon/Thumbnail (different