How would you design a modular WPF desktop application architecture?

A modular WPF application is designed using loosely coupled modules, typically with MVVM and a composition framework like Prism.

Modular architecture in WPF involves splitting the application into independent modules (UI, services, features) that can be loaded dynamically. Each module has its own Views, ViewModels, and services. Frameworks like Prism or MEF are commonly used. The shell application acts as a host and composes modules at runtime.