>Sheesh, when I try to open the .dll, it returns "The selected file is either invalid or not a type library" and it doesn't show up in the COM libraries list. I thought the registry entries showed that it was registered correctly for a .net COM component...
>

Is there a TLB file in the same directory as the DLL? If so, you could open that instead. If not, you can tell REGASM to generate one for you (at least I think this will work) using the /tlb:Filename switch.