You mean in Platinum?
I know how but you must promise not to tell Tanner or CW from NTI
You've seen the Splash.bmp file in the program folder? Rename or delete it.
Now you have to put another Splash.bmp there, (or else the program will fish a spare one from the resCDmkrPlatinum.dll !)
You can make a 1x1 pixel bmp and name it Splash.bmp or just put a nice pic of your girlfriend instead of that gastly dragon