how to change the windows logo in the left corner
windowclass.hIcon = (HICON) LoadImage( // returns a HANDLE so we have to cast to HICON
NULL, // hInstance must be NULL when loading from a file
"iconfile.ico", // the icon file name
IMAGE_ICON, // specifies that the file is an icon
0, // width of the image (we'll specify default later on)
0, // height of the image
LR_LOADFROMFILE| // we want to load a file (as opposed to a resource)
LR_DEFAULTSIZE| // default metrics based on the type (IMAGE_ICON, 32x32)
LR_SHARED // let the system release the handle when it's no longer used
);