VS 2008 AddIn bug with solution folders
It seems that the add-in can’t handle solution files that organize projects within folders. You can see this bug in action by bringing up Visual Studio and loading an existing solution & project. Right-click on the project and see that ‘ICE Configuration’ is enabled. Now right-click on the solution and choose Add->New Solution Folder and move the project under that folder. Right-click on the project and you will see that ‘ICE Configuration’ is now disabled.