The following table shows the keys that Regasm.exe typically adds to the Windows registry. The RegistrationServices class provides the equivalent functionality.Ī managed component must be registered in the Windows registry before it can be activated from a COM client. Regasm.exe adds information about the class to the system registry so COM clients can use the. You can run a command-line tool called the Assembly Registration Tool (Regasm.exe) to register or unregister an assembly for use with COM.