in reply to splashscreen

formally following one-liner for Win32 meets your requirements:
perl -MTk -we "$mw=tkinit;$mw->update;sleep(5)"
I expect you want to place image on a window, get rid of those system buttons at the top of window (this is also possible) and so on, but all this is really easy to do step-by-step.

Courage, the Cowardly Dog