Hi,
We are not sure what you are trying to accomplish, but please note that the process started like that would be running on a server (because you are starting it from server code) while your browser user is possibly on the other side of the world.
The reason why it worked in dev mode and not in registered app, is because non-interactive web server is a Windows service process, which has no UI and can run when no user is logged in to the machine. That's the reason you can't start an interactive program from a code executed from within a service.
If you are creating an application where your server and client are always on the same PC, then you should use UWS Interactive Host - the one used in dev, and then you would be able to start an interactive application, like calculator or media player.
Please also see
this thread.
Best regards,
UltiDev Team.
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