The following switches must be supported by booc.exe: /delaysign /keyfile /keycontainer The following attributes must be supported by BooCompiler: AssemblyDelaySignAttribute AssemblyKeyFileAttribute AssemblyKeyNameAttribute InternalsVisibleToAttribute This is a mojor feature that is needed. PS: It's possible to get around this limitation if booc.exe allows -t:module. Then one can do AL.exe /keyfile:foo.snk theModule theAssembly.dll