Visual Studio is perfectly willing to work with any file that you want to add to your solution -- you just have to tell it what editor to use.

Microsoft announced Tuesday at its Tech-Ed conference that it will add a new tool to Visual Studio that will visually model applications. Microsoft technical fellow Brian Harry demonstrated ...

Microsoft announced Tuesday at its Tech-Ed conference that it will add a new tool to Visual Studio that will visually model applications.

Importantly, the add-on isn't meant to replace current tools, but is instead meant to give developers extra options for creating their mods in Visual Studio's development environment.