read/write registery key file in uwp

I want to create or read a registry file within a uwp app.

Short answer is accessing to system registry is infeasible for a UWP app.

Under the UWP app model, each UWP app is isolated by running inside separate AppContainer. The runtime also isolates registry access.

You can find more information on UPW app model form the Build 2015 Keynote, slides can be found along with the video. https://channel9.msdn.com/Events/Build/2015/2-617

There’s also a deeper dive into the app model from https://blogs.windows.com/buildingapps/2015/04/30/a-deeper-dive-into-the-universal-windows-platform/

However, you can try out the Brokered Windows Runtime Components for side-loaded Windows Store apps. Essentially, it allows you UWP app to call Win32 API hosted in a different process, which runs outside of the App container.

Below is the brokered WinRT component template for VS2015 https://visualstudiogallery.msdn.microsoft.com/d2e9cac0-66a8-464a-a902-55ae765c8e6e?tduid=(c5f2776eb12ea55b8926d0c075062c9d)(256380)(2459594)(TnL5HPStwNw-gN1OuW5VyKxMyOTAH.bK0w)()

Below is a very good example for creating brokered components for UWP, https://xamltips.wordpress.com/2015/11/13/brokered-component-for-uwp-on-windows-10/

For more information, see to https://msdn.microsoft.com/en-us/library/windows/apps/dn630195.aspx