Hello @Stefan ,
On most systems this works as the PFX has a provider specified: "Microsoft RSA SChannel Cryptographic Provider". However on some systems it will still install using the provider: "Microsoft Software Key Storage Provider".
Microsoft RSA SChannel Cryptographic Provider associated with Cryptography API (CryptoAPI). While Microsoft Software Key Storage Provider associated with Cryptography API: Next Generation (CNG). So it seems CNG key storage provider selected instead of CryptoAPI Cryptographic Service Provider on "some systems".
- So one possible solution is via PFXImportCertStore with
"PKCS12_PREFER_CNG_KSP indicates that the CNG key storage provider (KSP) is preferred. If the CSP is specified in the PFX file, then the CSP is used...".
- Another possible solution is specifies the current user's default cryptographic service provider (CSP) via CryptSetProvider API. (Not tested.)
(Please share the differences between working and non-working systems to narrow down this issue if above solutions don't work for you.)
Note: CryptSetProvider is deprecated. New and existing software should start using Cryptography Next Generation APIs. Microsoft may remove this API in future releases.
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