open file from operating system with PWA

I have a progressive web app that can handle it's own project files. Name it .mypwaproj. When you're done with the project, you can download and share that file with someoneelse.

The main thing i want is when you double click that project file it should open my PWA and load the content.

Is it possible to get the file content into the PWA when you right click to the file on your operating system and pick the PWA to open with.

I also set my PWA as the default app for .mypwaproj file and when i double click it properly opens my PWA but how i can get the content of that .mypwaproj file? Actually It is simply a json data.