That is part of .Net 3 and removable in vLite (Vista), does not exist in XP/2k3 by default. If not visible it is WCF component, try vlite -extreme switch. FYI, there is a "lite" version of the .NET Framework 3.5 Service Pack 1 (latest version, which includes 3.5 SP1, 3.0 SP2 e 2.0 SP2), called Client Profile. http://download.microsoft.com/download/5/a...oymentGuide.htm The Client Profile will install only the necessary files to run applications build with .NET Frameworks, without bloating systems. .NET Framework development tools like Visual Studio, will not function on .NET Framework Client Profile. Developers will need to install full .NET Framework 3.5 Service Pack 1. Download from here: http://www.microsoft.com/downloads/details...;displaylang=en I hope this will be useful to someone