Sorry but I was never able to force Rick's registry.prg to work properly.
Therefore I used to use code which I sent to you. What was the error you got?

>That program did not work. It errored out. I do, however,
>have Rick Strahl's Registry.Prg.
>
>My code is:
>
>

>
>#DEFINE HKEY_CLASSES_ROOT -2147483648
>
>CLEAR
>
>SET PROCEDURE TO Registry.prg
>oReg = CREATEOBJECT('registry')
>
>oDll     = CREATEOBJECT("MyDll.MyClass")
>cClassId = COMCLASSINFO(oDll, 4)
>cClassId = "CLSID\" + cClassId + "\InProcServer32"
>
>? oReg.ReadRegistryString(HKEY_CLASSES_ROOT, cClassId, "ThreadingModel")
>? oReg.ReadRegistryString(HKEY_CLASSES_ROOT, cClassId, "(Default)")
>
>RETURN
>

>The first call to ReadRegistryString returns "Apartment", which is right.
>But the second, to get back the Default key, returns null.
>
>So how do I read the default key?