extern static bool PFXExportCertStoreEx( CertificateStoreHandle hStore, IntPtr pPFX, //IntPtr szPassword, string password, IntPtr pvReserved, PfxExportFlags dwFlags);
internal static extern bool PFXExportCertStoreEx( CertificateStoreHandle hStore, IntPtr pPFX, IntPtr szPassword, IntPtr pvReserved, PfxExportFlags dwFlags);