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ITsVISTA KB-Link: KB2513526

CryptSetProvider function or CryptSetProviderEx fails to change the user’s default cryptographic service provider (CSP).

When you try to change the user’s default cryptographic service provider (CSP) by calling the CryptSetProvider function or CryptSetProviderEx function with dwFlags set to CRYPT_USER_DEFAULT on the Microsoft products listed in the “Applies to” section, this results in the ERROR_CALL_NOT_IMPLEMENTED error.
This is by design.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2513526.

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