... Why?

There are so many different ways to do strings in C#. Adding features like this just makes the language harder to learn, and the compiler harder to implement.

At this point, it's probably better to adjust the compiler to make it easier to turn a text file into a hardcoded string. The embedded resource approach works, but it could be significantly smoother.

Or, maybe the compiler needs some form of a plugin architecture so people who want obscure features can figure out how to add them?