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.

Visual Studio .NET simplifies the process of installing your applications by providing an easy way to add the Setup Wizard to your applications. In this tip, Irina Medvinskaya will create a simple ...

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.