Strip the old version of Edge's PDF reader into a standalone PDF reading application

HotCakeX 

Unfortunately this is why I am pessimistic about a unified Windows UI. Both Microsoft and other manufacturers have begun to transform to PWA. A typical example is Figma or even a Web App. From many angles, this is not bad. This is a big improvement-except for a unified operating system. Interactive experience.

For many apps, Microsoft (and many manufacturers) have begun to use cross-platform development frameworks to simplify the development process and unify the software experience on various operating systems. ——Finally (although it is only part of it at present), the UI of the software has also begun to be consistent across platforms, usually not related to the operating system, but to shape the corporate brand image. Some software, such as Affinity, choose macOS as the main reference, and the interface of its Windows version is in line with macOS. Some software, such as Skype and Microsoft Teams, use their own unique UI, and have no specific association with any operating system.

This is why I think a unified Windows will be nowhere in sight...Since even Microsoft's own software is so "flying away" without restrictions, you can't expect software vendors to be willing to draw different UIs for different operating systems Up.