> However, when I try this apicall I get an error saying "Can't coerce
> arguments".
> 
> What am I doing wrong?

Passing an integer where an instance of Win32RegistryKey is expected.
E.g., the FFI does the equivalent of

	passedType isKindOf: expectedType

and if you insert

	Win32RegistryKey hKeyCurrentConfig isKindOf: Win32RegistryKey

you'll see that this is *not* equvialent.

Cheers,
  - Andreas