Microsoft® Visual Studio® 2010 Unleashed

Object Model Versions

The automation object model is actually implemented across four different, complementary primary interop assemblies (PIAs): EnvDTE, EnvDTE80, EnvDTE90, and EnvDTE100. EnvDTE is the original automation assembly distributed with Visual Studio .NET 2003. EnvDTE80 was the library distributed with Visual Studio 2005. EnvDTE90 is distributed with Visual Studio 2008 (yet another assembly, EnvDTE90a is installed with Visual Studio 2008 Service Pack 1). And finally, EnvDTE100 is the automation assembly required by Visual Studio 2010. The reason for multiple assemblies is simple: They help balance the need for new features against the need to preserve backward compatibility. For instance, with Visual Studio 2008, Microsoft was faced ...