Visual Studio SDK 4.0 Updates the Microsoft DSL Tools Version 1.0http://msmvps.com/blogs/kevinmcneish/archive/2007/03/25/visual-studio-sdk-4-0-updates-the-microsoft-dsl-tools-version-1-0.aspxIf you were previously using the Microsoft DSL Tools version 1.0 released back in September 2006 in the Visual Studio 2005 SDK 3.0, then you should definitely install the Visual Studio SDK 4.0 that includes bug fixes for Domain Specific Language ToolsenCommunityServer 2008.5 SP2 (Build: 40407.4157)