WPF application manifest file-Collection of common programming errors

I have a WPF application that I want to make it able to start always as an Adminstrator.I’ve been reading a lot about it and it seems that I have to create my own manifest file and pass it ot the Application properties so on runtime int starts as an Administrator.

The application itself loads a file and sometimes the file might demands administrator access so it can be modified.That is why I am looking for a way after the Application gets installed to be able always to get started in administrator mode.