If you skip the dialog for signed programs you may as well skip it for unsigned programs as well. Anyone can sign a program, it's only relevant for security if

If you skip the dialog for signed programs you may as well skip it for unsigned programs as well. Anyone can sign a program, it's only relevant for security if the user reads the signature and makes a decision based on what it says. From that perspective, maybe the dialogs for signed and unsigned programs don't _need_ to be very different; most users don't care. The interesting distinction is between "this a program, which may take over your computer" and "this is a music file, which can do no harm".