To a certain extent, you're describing the KParts framework from KDE 3/4 times (I don't know if it still exists today). Many people remember Konqueror as a file

To a certain extent, you're describing the KParts framework from KDE 3/4 times (I don't know if it still exists today). Many people remember Konqueror as a file manager and web browser, but it was actually a generic URL navigator that would load the right KParts component for whatever thing was being displayed. For an HTML file, the web browser component. For a directory, the file browser component. For a video, the media player component. When I was developing Palapeli (a puzzle game that ships as part of KDE Games), I did a KParts version of it for fun in a few lines of code. That made it so that if you had a puzzle file stored in a folder, you could navigate to it in Konqueror and the game view would come up inside of Konqueror. Back in the day, I dreamed of a fully document-oriented computing experience. Sadly the world has settled on the service-oriented experience of today, largely controlled by a small number of gigantic fiefdoms.