Why do I need to ungroup the icon in Word but not in PowerPoint or Excel?

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Although PowerPoint, Excel and Word are developed by the same company, they are not developed by the same team! That means that they all behave in slightly different ways. In software terminology, the object model in Word does not allow a programmer to design an add-in that can ungroup an imported vector picture which is why you need to do it manually before you can format it. This process also removes the jagged edges.