formally following one-liner for Win32 meets your requirements: 
perl -MTk -we "$mw=tkinit;$mw->update;sleep(5)"

[download]
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

In reply to Re: splashscreen by Courage
in thread splashscreen by Anonymous Monk

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