Cannot use CryptAcquireContext on a Incard smartcard

Hi all, I'm using a smart card ST Incard on an Athena reader. OS is win xp
prof.
The card runs well on both Outlook Express and Thunderbird. Both prompt for
a pin at the first access. The hard work is performed by a pkcs11 dll named
incryptoki2.
No way to succeed from Capi. Calling:

CryptAcquireContext(&hProv, NULL,
"SysGillo Cryptographic Service Provider", 1, 0)

always returns 0x45a, which might be ERROR_DLL_INIT_FAILED, although a
malformed error. No prompt for the pin. The same value is returned by
calling CryptAcquireCertificatePrivateKey after retrieving a certificate by
iteration.
All of this occurs both for a normal user and the admin.
Any help is appreciated, thanks.

url:http://www.ureader.com/gp/1659-1.aspx
.

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