What is the Difference between an Add-in and a COM Add-in?
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There are two types of add-ins for Office Applciations.  The standard add-in which can be compiled within PowerPoint® will have the extension .PPA.  A COM Add-in is a .DLL and is created by using either the Microsoft® Office Developer or development products from the Visual Studio Suite of applications.

pptXTREME products are COM Add-ins.