I have an assembly that I created in Visual Studio 2005. It is created in the directory c:\logging\bin\Release\logging.dll. I wish to use this assembly in visual studio 2003. When I try to add a reference to it I browse to it, select the file and then get "A referenct to 'c:\logging\bin\Release\logging.dll' could not be added. This is not a valid assembly or COM component. Only assemblies with extension 'dll' and COM components can be referenced. Please make sure that the file is accessible, and that it is a valid assembly or COM component" In other VS 2005 solutions I have added the "Logging" project and then set a project reference. Obviously with 2003 that is a problem. Any suggestions would be greatly appreciated.