Hi, Peter, I just followed your reproduce steps in the initial report and everything works fine. My testing environment is: Windows XP Service Pack 2 Visual Studio 2008 .Net platforms 2.0 (SP1 and SP2), 3.0 (SP1) and 3.5 (Eiffel Studio using .Net 2.0 in the project) Eiffel Studio 6.5.7.9743 GPL Edition - windows For your two issues: 1.For switching between .Net 1.1 and .Net 2.0 issue, I have not tested yet... 2.The "System" subdirectory not exists indeed. It only means you are using one .Net class from one .Net framework. If you are really interested in where are the Eiffel .Net classes. There are located at %ISE_EIFFEL%/dotnet folder. However, they are not readable. (stored by {SED_STORABLE_FACILITIES} I think) If this bug still exists on your machine? It seems maybe you have some special settings on your machine? Don't know if you are still available for this bug? Thanks Larry