PP_KEYSET_SEC_DESC for smartcards

Hello,

I'm having trouble with parameter PP_KEYSET_SEC_DESC for
CPGetProvParam: I know it's not supposed to be used with smart cards
and it is generally ignored, but an application working on Vista with
our smartcard is failing because this parameter isn't implemented.
Does any one have any idea how to go about this? I haven't been able
to find any code example anywhere...
Thanks!

.