http://blogs.msdn.com/kristoffer/archive/2007/12/07/how-does-virtual-earth-3d-find-and-load-plugins.aspxOn startup VE3D looks in the Plugins folder of the install directory (ProgramFiles\Virtual Earth 3D) and iterates through the assemblies in each subfolder of Plugins. A plugin named Sample would install itself as C:\Program Files\Virtual Earth 3D\Plugins\Sample\Sample.dll.en-USCommunityServer 2.1 SP1 (Build: 61025.2)