.NET framework has this "nice" feature called probing where it searches assemblies from various locations, including the /bin folder and loads them when the application starts. Is there a way to limit the assemblies that it loads? I've found out that it loads every file it finds, even if you rename the file extension to something else than dll. This would be usefull when updating assemblies with new ones so you could just rename the old one to assembly.dll.old and it would be ok. Currently this doesn't work.