Hello,

                I'm using the latest win32 binary of the libcurl library to
provide a HTTPS backend to a larger application (essentially, just to send a
POST request to a CGI script and parse a reply). The problem, however, is
that I can't seem to verify the server's CA certificate.

Since I'm not using the curl command line tool and the application should be
distributable without needing to install it, I was looking into options of
directly feeding the CA certificate to the library. The root certificate is
stored in windows cert storage, which I understand libcurl with OpenSSL
cannot directly access. I have tried exporting it as PEM and then using
CURLOPT_CAINFO to set this certificate as the certificate bundle, but that
simply fails with error 77 on curl_easy_perform without much explanation
(setting CURLOPT_CAPATH to NULL or the proper directory makes no
difference).

What is the correct way to do this, then?

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