1.) Open the desired file in Resource Hacker.
2.) Add your desired bitmap at any location not already used in file.
3.) Go to the desired dialog box.
4.) Right-click on the dialog box and select "Insert Control".
5.) Select "BITMAP" (3rd item in 2nd row).
6.) Now in "Caption" textbox, type the same location no, where u added the Image in Step. 2
7.) Thats it. Click on OK and now u can adjust image or dialog box width/height.