The ending PWZ denotes a PowerPoint Wizard. This file is a special version of a ppa add-in for the presentation software Microsoft PowerPoint. The PWZ files are structurally identical to ppa files, contain VBA (Visual Basic for Applications) and can be loaded at the start of PowerPoint.
AddIns extend PowerPoint with additional features, such as new features or the ability to run macros. The addins can be created by the user or come from other developers. Wizards guide the user through the application of a specific function or sequence of functions.