The default installation folder C:\Program Files\Microsoft Enterprise Library 4.1 - October 2008 Bin - contains the binaries you can use in the application. Also the configuration editor EntLibConfig.exe which can be used to create and edit configuration files for EntLib Docs - documentation Src - contains the installer file for the Enterprise Library source file Visual Studio Integration - contains binaries that make the configuration Editor available in Visual Studio The installer also puts the original source code in C:\EntLib41Src ...